Other Ending Letters

Word Lengths Starting With R

All 447 Matching Words

rabbanimplural of rabbirabbidomThe role or status of rabbi.rabbinismAlternative letter-case form of Rabbinism.rabbitdomThe state or essence of being a rabbit.rabiformResembling or characteristic of rabies.rabulism(rare) a tendency to shyster or to quibble.racemiformHaving the shape of a raceme.racemism(chemistry) The property of being racemic.racetamAny of a class of nootropic drugs that share a pyrrolidone nucleus.rachitismSynonym of rachitis (“rickets”).racialismThe belief that humans can be categorized as belonging to distinct races, each race being characterized by fixed and heritable traits.racismPrejudice or discrimination based upon race or ethnicity; (countable) an action of such discrimination.radargram(planetology, geology) A radar image of mineral deposits or a planetary surface.radarkymogramA graphical record produced by radarkymography.radfem(slang, sometimes derogatory) A radical feminist.radiatiformHaving the appearance of being radiate.radicalismAny of various radical social or political movements that aim at fundamental change in the structure of societyradiciform(botany) Having the nature or appearance of a root (radix).radioactinium(physics) The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 yearsradioaluminiumradioactive aluminium (especially when used as a tracer)radioaluminumAlternative form of radioaluminium.radioautogram(sometimes proscribed) Synonym of autoradiograph.radiobariumradioactive bariumradioberylliumradioactive berylliumradiocadmiumradioactive cadmiumradiocaesiumradioactive caesiumradiocalciumradioactive calcium (especially when used as a tracer)radiocardiogram(medicine) An X-ray recording of the progress of radioactive material injected into the chambers of the heart.radioceriumradioactive ceriumradiocesiumradioactive cesiumradiochromatogramA recording made by means of radiochromatography.radiochromiumradioactive chromiumradiodysprosiumradioactive dysprosiumradioembolismA radiotherapy in which radioactive nanoparticles are injected into an artery and travel to an organ (typically the liver) where they settleradioerbiumradioactive erbiumradioeuropiumradioactive europiumradiogadoliniumradioactive gadoliniumradiogalliumradioactive gallium (especially when used as a tracer)radiogermaniumradioactive germaniumradiogram(radio, historical) Synonym of radiogramophone (“a gramophone record player that incorporates a radio receiver”).radiohafniumradioactive hafniumradioheliumradioactive heliumradioindiumradioactive indiumradioiridiumradioactive iridiumradiolanthanumradioactive lanthanumradiolithiumradioactive lithiumradiolutetiumA radioisotope of lutetiumradiomagnesiumradioactive magnesiumradiometabolismThe scientific study of metabolism using radioactive markers.radiomodemAlternative form of radio modem.radiomolybdenumradioactive molybdenumradioniobiumradioactive niobiumradioosmiumradioactive osmiumradiopalladiumradioactive palladiumradioplatinumradioactive platinumradiopotassiumradioactive potassium (especially when used as a tracer)radiorheniumradioactive rheniumradiorubidiumradioactive rubidiumradiorutheniumradioactive ruthenium.radiosamariumradioactive samariumradioscandiumradioactive scandiumradioseleniumradioactive seleniumradiosodiumradioactive sodium (especially when used as a tracer)radiostrontiumany radioactive isotope of strontium, especially 9038Srradiotantalumradioactive tantalumradiotechnetiumradioactive technetium.radiotelegram(telegraphy, historical) A message, like a telegram, transmitted by wireless telegraphy.radiotelluriumradioactive tellurium (tellurium-128 and tellurium-130)radioterbiumradioactive terbiumradiothalliumradioactive thalliumradiothorium(physics) The radioactive isotope thorium-228radiothuliumradioactive thuliumradiotitaniumradioactive titaniumradiotrophismThe condition of being radiotrophicradiotropismMovement to or from ionizing radiationradiouraniumradioactive uranium.radiovanadiumradioactive vanadiumradioytterbiumradioactive ytterbiumradioyttriumradioactive yttriumradiozirconiumradioactive zirconiumradiumThe chemical element (symbol Ra) with an atomic number of 88. It is a soft, shiny and silvery radioactive alkaline earth metal.raetamAlternative form of retem.ragamAlternative form of raga (“melodic form in Indian music”).ragamuffinismThe appearance or behaviour of ragamuffins.ragwormA polychaete worm in the genus Nereis or the family Nereididae, often used as bait in fishing.railwaydomThe world or sphere of railways.raimAlternative form of rame.rainbowism(South Africa, derogatory) The disregarding or sugarcoating of race-related issues using the idea of the Rainbow Nation.rainstormA storm characterized by substantial, heavy rainfall.rajadomAlternative form of rajahdom.rajahdomThe territory ruled by a rajah.ralliformBelonging to the rails of family Rallidae.ram(zoology, agriculture) A male sheep, typically uncastrated.ramentum(botany) One of the thin brownish chaffy scales found on the epidermis of the leaves or young shoots of some fernsramiformHaving the shape of a branch.ramoconidiumAn intercalary or apical branch of a conidiophore that detaches and functions as a conidiumranariumA place where frogs are bred.randemInvolving three horses harnessed one behind the other.randomA roving motion; course without definite direction; lack of rule or method; chance.raniform(rare, chiefly zoology) Shaped like a frog; resembling a frog.rankismAbuse, discrimination, or exploitation based on rank.rankogramA graphical illustration of the relative ranks of a group of treatments etc.ranksumAlternative form of rank sum.ransomMoney paid for the freeing of a hostage.rapacuronium(pharmacology) A nondepolarizing neuromuscular blocker formerly used in anesthesia.rapismA paraphilia in which a person is aroused by rape, i.e. forcing somebody into sexual acts against their will.rapscallionismThe behaviour of rapscallions.rasamA spicy South Indian soup made with tamarind juice.rascaldomThe state of being a rascal.rascalismThe behaviour of a rascal; villainy.rasmThe base shape of an Arabic-script letter, without dots that distinguish it from other letters.rastellumIn certain mygalomorph spiders, a row of stiff spines on the chelicera.rastergramAn image composed of coloured dots that appears to be three-dimensional when viewed correctlyrastrumA five-pointed writing implement used to draw parallel lines of a staff in sheet music.ratificationism(philosophy) A doctrine stating that ratifiable choices are the ones that should be made.rationalism(philosophy) The theory that reason is a source of knowledge independent of and superior to sense perception.rationalisticism(archaic) specious reasoning that pretends to be rationalrattachism(politics) An ideology calling for the French-speaking part of Belgium or Wallonia to secede from the state of Belgium and become part of France.ravendomThe world or sphere of ravens.rawismThe dietary practice of eating only uncooked, unprocessed, and often organic foods.raycizzum(alt-right, mockingly) A deliberate misspelling of racismrazobazam(pharmacology) A benzodiazepine derivative with nootropic effects.razorclamAlternative form of razor clam.reaccustomTo accustom again.reactionarismAlternative form of reactionaryism.reactionaryism(politics) The advocacy of reactionary political positions.reactionism(politics) Synonym of reactionaryism.readerdomThe realm, sphere, influence, or body of readers; readers collectively; readership.reaffirmTo affirm again.realarm(transitive) To alarm again.realismA concern for fact or reality and rejection of the impractical and visionary.realm(also figurative) A sphere of knowledge or of influence; a domain.ream(UK dialectal, Northern England, Scotland) Cream; also, the creamlike froth on ale or other liquor; froth or foam in general.rearmTo replace or restore the weapons or arms of a previously defeated, or disarmed army, country, person or other body.rebaptismA second or subsequent baptism; the act or ceremony of rebaptizing.rebeldomThe realm or sphere of rebels; rebels collectively.rebloom(intransitive) To bloom again.reblossom(intransitive) To blossom again or anew.rebottom(transitive) To repair by replacing the bottom.recallismA radical Bolshevik policy demanding that the Russian Social Democratic Labour Party cease all participation in legal state establishments and recall its representatives from the duma.recam(video games) A recreated gameplay recording of this kind.recapitulationism(embryology) The doctrine that during embryonic development various structures develop that appeared during the evolutionary history of the species.recentism(rare) A focus on recent events to the exclusion of history.receptaculum(anatomy) A receptacle.receptionism(theology) The Anglican doctrine that, during the Eucharist, the bread and wine remain unchanged after consecration, but that communicants receive the body and blood of Christ by faith when they consume the bread and wine.recidivismCommitting new offenses after a crime committed in the past.reciprocitarianismReciprocitarian beliefs generally.reclaim(transitive) To return land to a suitable condition for use.reclazepam(pharmacology) A benzodiazepine drug with sedative and anxiolytic effects.reconfigurationismAn emphasis on reconfiguring what already exists rather than create something entirely new.reconfirmTo confirm again; to establish more firmlyreconformTo conform again.reconstructionismAny of various religious movements aiming to reconstruct something.reconstructivismA postmodern movement concerned with the conscious reconstruction of reality, particularly, but not exclusively, with regard to social reality.recreationism(theology) The concept that the world may be conceived as being created anew at every instant in time.rectilinearism(art) The use of straight lines.rectum(anatomy) The terminal part of the large intestine through which feces pass after exiting the colon, but before leaving the body through the anus or cloaca.recuroniumMisspelling of rocuronium.redam(transitive) To dam again.reddendum(law) A clause in a deed by which some new thing is reserved out of what had been granted before; the clause by which rent is reserved in a lease.redeem(transitive) To recover ownership of something by buying it back.redemptionism(theology) The doctrine that all of humanity was redeemed through the death and resurrection of Jesus Christ and that the redemption of all was completed and concluded in Jesus's resurrection, and that there was no further need for scriptural fulfillment thereafter.redgumThe American sweetgum, Liquidambar styraciflua.redistributionismThe political and economic philosophy of redistribution of wealth.redneckism(neologism) The beliefs or behaviours of rednecks.redreamTo dream again.redrumTo place into new drums (barrels).redstemAmmannia, in family LythraceaeredtapismAlternative form of red-tapism.reducetarianismThe practice of following a reducetarian diet.reductionismAn approach to studying complex systems or ideas by reducing them to a set of simpler components.reductivismExtreme simplification; reduction to a minimum; use of the fewest essentialsredwormA type of small, reddish earthworm, Lumbricus rubellus, used as bait in angling; also, in later use, the brandling, Eisenia foetida.reem(transitive, nautical) To open (the seams of a vessel's planking) for the purpose of calking them.reequilibriumA new equilibrium formed after a change from an earlier equilibrium.referendum(politics) A direct popular vote on a proposed law or constitutional amendment.refilm(transitive) To film again.reflectionismThe view that cultural phenomena (literature, art, etc.) simply mirror the ideology of the dominant economic patterns of society.reflectivismAny of various theoretical approaches that oppose rational-choice accounts of social phenomena and, perhaps, positivism more generally.reflectogramThe set of data captured in an application of reflectography.reformThe change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve itreformandumThat which is to be reformed.reformationismBelief in the teachings of the Reformation.reformismAny of several movements that promote reformrefrigerium(obsolete) Cooling refreshment; refrigeration.refugeedomThe state of being a refugee.refugeeismThe state of being a refugee.refugiumAny local environment that has escaped regional ecological change and therefore provides a habitat for endangered species.refutandumSomething that is to be refuted.refutationism(epistemology) A scientific philosophy based on the requirement that hypotheses must be falsifiable in order to be scientific; if a claim is not able to be refuted it is not a scientific claim.regalismThe doctrine of the ecclesiastical supremacy of a sovereign.regenerationism(historical) An intellectual and political movement in late 19th and early 20th century Spain, seeking to make an objective scientific study of the causes of Spain's decline as a nation and to propose remedies.regionalismAffection, often excessive, for one's own region and to everything related to it.regionismregionalism; a tendency to administer an area as separate regionsregnum(biology, taxonomy) A rank in the classification of organisms, below dominium and above divisio.regressionismA tendency toward regression.regressivismRegressive attitudes or policies.regroom(transitive) To groom again.rehabilitationismThe belief that criminals should be rehabilitated into society.rehem(transitive) To supply (a garment, etc.) with a new hem.rehoboamAlternative letter-case form of Rehoboam.reim(South Africa) A strip of oxhide, deprived of hair and made pliable, used for twisting into ropes, etc.reinformTo inform again.reism(philosophy) A form of concretism stating that (i) every object is a body and (ii) no object is a state or relation, or property.rejectionismThe political position of reflexively rejecting a policy or proposal.relationalism(physics) The idea that time and space are not real objects, but merely orderings of objectsrelationism(philosophy) The doctrine that relations between things have a real existence.relativism(countable, philosophy) A specific such theory, advocated by a particular philosopher or school of thought.relatum(logic, philosophy) A term that is related to the referent.relebactam(pharmacology) A particular lactamase inhibitor.reliabilism(epistemology) Any of a group of related doctrines holding that knowledge or justified belief must be the result of a reliable processrelictualismThe fact of being a relict in the biological sensereligionismexcessive religious ardour or zealreligismPrejudice based on religious affiliation.rem(often capitalized) Initialism of rapid eye movement, a sleep state.remiformShaped like an oar or paddle.remimazolam(pharmacology) A benzodiazepine drug.remodernismA movement aiming to revive aspects of modernism, in response to postmodernism, which is viewed as cynical and spiritually bankrupt.renegadismThe beliefs and practices of renegades.renewalismthe broader current within Christianity that emphasizes the Holy Spirit, including the charismatic and Pentecostal movementsreniform(chiefly biology, mineralogy) Synonym of kidney-shaped (“having an approximately circular or elongated ovoid shape with an inward curve or indentation on one side”).renogramA medical scan of the kidney.renorm(transitive) To norm again or differently.renovationismA belief in the improvement of society by the spiritual renovation of the individual.repagulum(zoology) A modified abortive egg that may be used to protect the other eggs from predation.reparandum(linguistics) An error in speech that is subsequently corrected ("repaired") by the speaker.repealismSupport for the repeal of a law or policy.reperform(transitive) To perform again or anew.reperm(transitive) To perm (the hair) again.replatform(computing, transitive) To migrate to a different platform.replum(botany) The framework of some pods, such as the cress, which remains after the valves drop offreporterismThe work of reporting the news; journalism.representationalism(philosophy) The belief that the conscious perception of the world is actually an internal replica of the world in the mind of the beholder.representationism(philosophy) The doctrine that thoughts are representations of real, external objectsrepressionismA policy of repression.repressivismRepressive attitudes or policies.reproclaim(transitive) To proclaim again.reproductionismThe idea that social institutions such as school and the workplace act to reproduce existing social inequalities in subsequent generations.reprogram(transitive, computing) To program anew or differently.reptariumA glass tank in which reptiles are held for displayreptilariumA place artificially arranged for keeping or raising reptiles.reptiledomThe state of being a reptile, or of belonging to the world of reptiles; reptiles, collectively.reptiliformResembling or relating to reptiles.reptiliumAn enclosure in which reptiles are keptrepublicanismThe political ideology of being a citizen in a state as a republic under which the people hold popular sovereignty.republicismrepublicanismrepudiationismA policy of repudiation.reputationismA policy of reputation.requiemA Mass (especially Catholic) to honor and remember a dead person.requisitumSomething that is asked for; the answer demanded by a problem.rereformTo reform again.rescreamTo scream again.reservationismIndia's system of reserving seats in government and in higher educational institutions for certain underprivileged groups.reservismThe practice of an employee being kept in reserve and asked to work only when needed.reshimTo shim a second or subsequent timeresiduumThe residue, remainder or rest of something.resignationismA philosophy of resigning oneself to whatever may happen; defeatism.resilium(zoology) An internal ligament that holds together the two valves of certain bivalve mollusks.resiniform(archaic) Having the form of resin.resistentialism(humorous) The belief that some inanimate objects exhibit malice toward humans.resistogramA graphical display of the bacterial resistance to a group of antibioticsreskim(transitive) To skim again.resorcinismresorcinol poisoningresourceism(rare) A human tendency to regard the natural environment as a set of resources to be exploited.respiratoriumA gill-like organ used by certain insects to draw water from the air.respirogramA graphical representation of deep breathingresponsumsingular of responsarestemTo force back against the current.restiform(anatomy) Formed like a rope; applied especially to several rope-like bundles or masses of fibres on the dorsal side of the medulla oblongata.restitutionismThe belief in restitution, as of stolen goods to the person robbed.restorationismAny movement or opinion that seeks to restore something to the way it was.restream(transitive) To stream again or differently (in various senses).restrictionism(economics, politics) The advocacy of restrictions on free trade, immigration etc.restrictivism(theology) The view that Christian salvation is possible only for those who have heard about the gospel of Jesus and put their faith in Jesus prior to their death.restroom(US, Philippines, euphemistic) A room containing a public toilet: a public lavatory.resum(transitive) To perform resummation upon.resurrectionismBelief in, or the event of, a person being resurrected from the dead.retaliationismA policy of retaliation.retardism(dated) Mental retardationreteam(transitive) To team (two or more people) together again.retemA shrub with white flowers, possibly Retama raetam; the juniper of the (King James Version) Old Testament.reteporiformForming colonies that are erect and fenestrate.retherm(informal) To rethermalize.reticuloendothelium(biology) The reticuloendothelial cells of an organism considered as a groupreticulogram(genetics) A graphical representation of a reticulate evolutionary structurereticulopodium(biology) A form of pseudopodium having a network of threadsreticulumA pattern of interconnected objects.retifismThe sexual fetish of attraction to shoes.retiformHaving the form of a net; reticulateretinaculum(anatomy) A connecting band.retinasphaltumAlternative form of retinasphalt.retineum(archaic, zoology) Part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate, hypothetical membrane resembling the retina.retinogramAn image of the retina obtained by retinographyretransform(transitive) To transform again, or transform back.retreatismA policy or advocacy of retreat.retributivismA philosophy of law, stating that criminals should be punished (retribution) for the harm they have caused.retrim(transitive) To trim again.retrodeformTo carry out a retrodeformationretrofuturismThe revival of historical conceptions of the future in media and design.retrognathism(anatomy) The quality of being retrognathic.retrogradismSupport for retrogression.retrogressionismSupport for retrogression.retronym(linguistics) A new word or phrase coined for an old object or concept whose original name has become used for something else or is no longer unique, or which did not originally have a specific name.retroperitoneum(anatomy) The space in the abdominal cavity behind the peritoneum.retroperitoniumMisspelling of retroperitoneum.retrospleniumThe retrosplenial cortexreunificationisma policy advocating reunification.reunionismA policy in favour of reunion.revacuumTo vacuum again.revanchismThe political policy of endeavouring to regain lost territory.revelationismThe belief in divine revelation.revengismA tendency to carry out, or preoccupation with, revenge.reversalism(philosophy, theology, uncountable) The idea that what is true about the universe is the exact opposite of what a person or group of people believes.reversgramSynonym of semordnilap.reversionismReversionist beliefs or attitudes.revisionism(historiography) The advocacy of a revision of some accepted theory, doctrine or a view of historical events.revivalismAdvocacy for the revival of a former practice, custom, etc.revolutionismThe state of being in revolution or a revolutionist.rewarmTo warm again; to bring back to a state of warmth.rhabditiformHaving the form of a nematode of the order Rhabditida.rhabdomAny of the rods that support each ommatidium in the compound eye of arthropodsrhapsodismA rhapsodic style or mood.rhedariumA structure used for storage, sale, or manufacture of horse-drawn carriages.rheniumA metallic chemical element with the atomic number 75: a heavy, silvery-gray transition metal.rheocardiogramAn image produced by rheocardiography.rheoencephalogramThe diagnostic image produced by rheoencephalography.rheogramA graphical representation of the rheological characteristics of a material, typically a graph of shear flow versus shear stressrheomorphism(geology) The liquefaction of rock, and subsequent flowing and intrusion into surrounding rocksrheotropism(biology) Movement stimulated by a current of water.rheum(uncountable) Thin or watery discharge of mucus or serum, especially from the eyes or nose, formerly thought to cause disease.rheumatism(pathology) Any disorder of the muscles, tendons, joints, bones, nerves, characterized by pain, discomfort and disability.rhimThe rhim gazellerhinariumThe naked surface of skin around the external openings of the nostrils of the nose in most mammals, usually more or less moist and embossed.rhinocerotiform(zoology, rare) Shaped like (that of) a rhinoceros.rhipidium(botany) A scorpioid cyme whose successive pedicels follow a zigzag path on the same plane.rhizobacterium(ecology) Any bacterium that has a symbiotic relationship with legumes via its rhizomesrhizobium(biology) Any of various bacteria, of the genus Rhizobium, that form nodules on the roots of legumes and fix nitrogen.rhizoderm(botany) Synonym of rhizodermis.rhizopodiuma pseudopodium of the rhizopods.rhodammonium(chemistry, obsolete) A cation, Rh₂(NH₃)₁₀⁶⁺, containing rhodium and ammonia.rhodiumA rare, hard, silvery-white, inert metallic chemical element (symbol Rh) with an atomic number of 45.rhodocenium(organic chemistry) The unipositive cation of rhodocene.rhodosperm(obsolete) Any seaweed with red spores, in the former class Rhodospermeae.rhombiform(geometry) In the shape of a rhombus.rhomboideum(anatomy) The ligament that joins the sternal end of the clavicle with the cartilage of the first rib.rhopalism(poetry, rhetoric) rhopalic structurerhopalium(zoology) One of the small sensory tentacular structures of various jellyfish species.rhotacismAn exaggerated use of the sound of the letter R.rhoticismAlternative form of rhotacism.rhum(obsolete or archaic except Philippines) Alternative form of rum, an alcoholic beverage distilled from sugarcane, similar spirits.rhynchodaeumA cavity in some gastropods that contains the proboscis.rhynchonelliform(zoology) Belonging to relating to the Rhynchonelliformea.rhynchosporiumAny of several fungi, of the genus Rhynchosporium, that are pathogenic to cereals.rhythmThe variation of strong and weak elements (such as duration, accent) of sounds, notably in speech or music, over time; a beat or meter.rhythmogram(biology) A graphical representation of the response to a continuous stimulus.ribbonwormAlternative form of ribbon worm.riboleukogramThe graphical representation of leukocyte RNA circulating in the blood after traumariboplasmThe part of an anammox bacterium that holds the chromosome, ribosomes and anammoxosome; it is surrounded by the paryphoplasm that is analogous to the periplasm that surrounds the cytoplasm in Gram-negative bacteriarichdom(rare) Wealth; riches; richness; prosperity.ricinismricin poisoningricinium(historical) A mantle worn, mainly by women, in Ancient Rome.riddimA subgenre of dubstep known for its heavy use of repetitive and minimalist sub-bass and triplet percussion arrangements.riemAlternative form of reim.rifledomThe world or sphere of rifles.rightism(uncountable) Belief in, or support of, the principles of the political right.rigorismstrictness (in interpreting or enforcing a rule)rigourismAlternative form of rigorism.rimAn edge around something, especially when circular.ringwormA contagious fungal infection of the skin, characterized by ring-shaped discolored patches, covered by vesicles or scales.ripariumA type of vivarium that mimics a shoreline or riverbank, featuring a large water area with minimal land, usually represented by semi-aquatic plants emerging from the water.ripazepamA pyrazolodiazepinone derivative with anxiolytic effects, structurally related to certain benzodiazepine drugs.risbermA glacis in jetties to withstand the violence of the sea.risdiplamA drug for the treatment of spinal muscular atrophy.riseformAlternative spelling of rise form.ritualismThe belief that it is necessary for rites or repeated sets of actions to be carried out.riverbottomAlternative form of river bottom.rizom(also heraldry) A plume or ear, as of oats or corn.rmInitialism of right margin.roam(intransitive) To wander or travel freely and with no specific destination.roboticismRobotic behaviour.robotismThe policy or process of using robots; robotization.rockism(derogatory) A kind of music snobbery that views rock music as superior or normative and values music with "authentic" production values over modern "manufactured" and electronic forms.rockstardomThe state or quality of being a rockstar.rocuronium(pharmacology) An aminosteroid nondepolarizing neuromuscular blocker used in anesthesia, to facilitate endotracheal intubation, and to provide skeletal muscle relaxation during surgery or mechanical ventilation.rodhamA bank of silt on the bed of a dried-up riverrodogramA form of variogram that plots the square root of spatial differencesroentgeniumA transuranic chemical element (symbol Rg) with atomic number 111.roentgenkymogramAn image produced by roentgenkymography.rolipramAn anti-inflammatory racetam drug being researched as a possible alternative to current antidepressants.rollerdrum(biology) A rolling drum used to culture cellsrollform(transitive) To form (sheet metal) into a desired cross section through continuous bending of a long strip of the metal as it passes through a set of rollers.rollrimA mushroom with a round, folded-over cap-edge, as those of the genus Paxillus.rolziracetamA nootropic drug of the racetam family.rom(proofreading) Abbreviation of roman.romanticismA romantic quality, spirit or action.romantismAlternative form of romanticism.romcom(film) Clipping of romantic comedy.romerogram(paleontology, uncommon) A cladogram that doubles as a spindle diagram.romiplostimA fusion protein analog of thrombopoietin.rondocubism(art) A form of cubism, in post-World War One Czechoslovakia, that employed more rounded formsronnagram(metrology) An SI unit of mass equal to 10²⁷ grams. Symbol: Rgrontogram(metrology) An SI unit of mass equal to 10⁻²⁷ grams. Symbol: rgroofbeamAny of the beams that form a roof.room(now rare) An opportunity or scope (to do something).rootogramA frequency graph in which one axis is scaled by the square root of the frequencies, so as to emphasize the smaller values.rootwormA worm that tunnels through the roots of young plants.rosaceaformAlternative form of rosaceiform.rosaceiform(medicine) Resembling rosacea.roseobacteriumAny bacterium of the genus RoseobacterrosewormThe larva of any of several species of lepidopterous insects that feed upon the leaves, buds, or blossoms of the rose, especially Choristoneura rosaceana, the bristled roseworm, oblique banded leaf roller, or rosaceous leaf roller, and the curled roseworm.rostelliform(entomology) Having the form of a rostellum, or small beak.rostellumA small beak-like process or extension; a small rostrum.rostriform(archaic) Having the form of a beak.rostrulum(obsolete, entomology, anatomy) A little rostrum (beak-like projection of an insect).rostrumA dais, pulpit, or similar platform for a speaker, conductor, or other performer.rotacismAlternative spelling of rhotacism.rotiformHaving the shape of a wheel.rototomA drum that has no shell and is able to change pitch by rotating its drumhead around a threaded metal ring.roum(obsolete) A deep blue dye.roundarm(cricket) An obsolete style of bowling where the bowler's arm is at right angles to the body at the point of delivery.roundwormAn invertebrate animal of the phylum Nematoda and other similar phyla. Many species of roundworms are parasites.routinismprevalence of, or domination by, routinerowdyismThe state of being rowdy.royalismImpassioned allegiance to or advocacy of the establishment, maintenance, and/or interests of a particular king, royal house, or kingly dynasty; sometimes extended to the same of a non-royal (i.e., grand ducal, imperial, or other) family or sovereign; often contrasted with monarchism.rpmAlternative letter-case form of RPM.rubberismFetishism for rubber or rubberwear.rubidium(uncountable) The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.rubiform(archaic) reddishrubricism(Christianity, derogatory) A pedantic or scrupulous emphasis on following rubrics, that is, written directions and regulations, in celebrating the liturgy.rubrozemA kind of reddish-yellow podzolic soil.rudefem(slang) A radical feminist who is blunt, confrontational, and sometimes abusive in their approach.ruffiandomThe state or condition of a ruffian.ruffianismThe behaviour of a ruffian; ruffians collectively.ruiniform(geology, mineralogy) Having the appearance of the ruins of buildings, despite being natural in origin.ruinismAn ideology that leads to the destruction of society.rum(uncountable) A spirit distilled from various preparations of sugarcane, particularly fermented cane sugar and molasses.rumdumA cocktail made from rum, applejack and lime juice.ruminoreticulumThe rumen together with the reticulum of a ruminant stomachrumortism(humorous) A tendency to spread rumors or gossip.rumourtismAlternative form of rumortism.runiformResembling, or in the form of, runes.ruralismAdvocacy of rural life instead of urbanism or city living.rurbanismRurban living generally; the combination of urban and rural characteristics in a place.russoom(India, historical) A fee, commission, or perquisite.rusticismA rustic custom or characteristic.rutheniumA metallic chemical element (symbol Ru) with an atomic number of 44.rutherfordiumA transuranic chemical element (symbol Rf) with an atomic number of 104.