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aandblom(South Africa) Any of several, typically evening blooming, flowers related to the Iris, in particular of the genus Hesperantha.abomasum(biology, food) The fourth digestive compartment of the stomach of a cow or other ruminant, after the omasum;absurdumAn illogical conclusion or state.accustom(transitive, often passive voice or reflexive, with to) To make familiar by use; to cause to accept; to habituate, familiarize, or inure.achenium(botany) acheneaciculum(botany, zoology) A needlelike spine or bristle, specially the seta of an annelidacneform(pathology, especially of a rash) Resembling acneaconitumThe poisonous herb aconite; also, an extract from it.acontiumOne of a series of threads of a septum of some actiniansacosmismA denial of the existence of the universe as distinct from God.acrotism(medicine) A lack or defect of the pulse.actigramAlternative form of actogram.actinism(chemistry, physics) That property of electromagnetic radiation that leads to the production of photochemical effectsactiniumA radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.activismThe practice of using action to achieve a result, such as political demonstration or a strike in support of or in opposition to an issue.actogramA graphical representation of the activity of an animal that has been isolated from environmental cues as to the time of day.actorism(rare) The manner or habits of an actor.addendumSomething to be added; especially text added as an appendix or supplement to a document.adhocismAlternative spelling of ad hocism.adiantumThe maidenhair fern and related ferns (of the genus Adiantum)adorcismThe voluntary, desired or curative possession by a spirit.adultismA predisposition towards adults (or a bias against children or other younger people).aecidium(mycology) A member of the form genus Aecidium.aerarium(historical) The state treasury of Ancient Rome.aeriformPertaining to air.aerobism(biology) aerobic respirationaerobium(obsolete, rare) Synonym of aerobe.aerogramA thin piece of foldable and gummed paper for writing a letter and serving as its own envelope for transit via airmail.agapeismAlternative form of agapism.agathismThe doctrine that the ultimate end of all things is good, although the intermediate means may be evil.ageratumAny of the genus Ageratum of tropical American herbs, annuals and perennials, from the sunflower family Asteraceae, tribe Eupatorieae; they are sometimes used in floral displays.alakazamA magic word used in conjuring; presto, shazaam.alarmismThe raising of needless alarms.alastrim(medicine) A milder variant of smallpoxalbarium(art) A form of lime, made by heating marble, used for stucco.albinismCongenital lack of melanin pigmentation in the skin, eyes, and hair or feathers (or more rarely only in the eyes); the condition of being albino.alburnumsapwood; the soft, newer wood in the trunk of a tree found between the bark and the hardened heartwood.algorism(uncountable, historical) Calculation with Arabic numerals.alienismThe fact or position of being an alien; alienage.alinotumThe anterior, wing-bearing division of the pterothoracic notum in insects.allelism(genetics) The existence of two or more alleles of a geneallochem(petrology) a grain of rock in a carbonate rockallodium(dated or historical) Freehold land or property; land held in allodial tenure, or one's title to such land.alloformA distinct form of something treated as a single kind or species.allotagm(linguistics, tagmemics) Any of the possible surface forms yielded by a tagmeme.alluviumsoil, clay, silt or gravel deposited by flowing water, as it slows, in a river bed, delta, estuary or flood plainalpinism(sometimes capitalized) Mountain climbing.alsifilmA thin, transparent, flexible film made from bentonite.altigramA plot of altitudes produced by an altigraph.altruismRegard for others, both natural and moral without regard for oneself; devotion to the interests of others; brotherly kindness.aluminumAmerican, Canadian, and Philippines standard spelling of aluminium.ambigramA calligraphic design that may be read as the same word or phrase (or sometimes different words or phrases) when oriented in two different ways, usually when reflected along a vertical or horizontal axis or when rotated through 180 degrees.ambulism(pathology) A disorder involving walking.amiiform(zoology) Of or relating to the Amiiformesammonium(inorganic chemistry) The univalent NH₄⁺ cation, derived by the protonation of ammoniaanancasm(philosophy) In the philosophy of Charles Peirce, a mode of evolution occurring by mechanical necessity.ancestimA recombinant methionyl human stem cell factor.andronymA man's name or a word derived from a man's name.anestrumSynonym of anestrus.aneurismAlternative spelling of aneurysm.aneurysm(pathology) An abnormal blood-filled swelling of an artery or vein, resulting from a localized weakness in the wall of the vessel.angeldomThe world of angels.angelismA doctrine that regards humans as angelic.angstrom(physics, metrology) A unit of length equal to 10⁻¹⁰ meters (that is, one ten-billionth of a meter), approximately the size of an atom, and denoted by the symbol Å, used especially to measure the wavelength of electromagnetic radiation or distances between atoms.anilopamAn opioid analgesic of the benzazepine class.anoikismThe splitting up of a town into smaller unitsansiformHaving the form of a loopanteroomA room before, or forming an entrance to, another; a waiting room.antiatom(particle physics) Any atom composed of antiparticles; an antimatter atom.antiboomCountering an economic boom.antifarmOpposing farms.antifilmOpposing films (audiovisual productions).antifoamAny chemical agent that inhibits the formation of foam.antiform(art) A form that defies the usual conventions of artistic forms.antigermCountering germs.antigramEither of a pair of anagrams with opposite meanings.antipoem(poetry) A work of antipoetry.antiroomObsolete form of anteroom.antiscamActing against scams.antispam(Internet) Countering spam (unwanted electronic mail).antiwormPreventing or countering worms.aphelium(obsolete) Synonym of aphelion.aphetismThe aphetized form of a word, i.e. a word which has dropped its initial vowel or syllable, such as squire or vanguard.aphorismA concise expression of a principle in an area of knowledge; an axiom, a precept.apiculum(botany) A short, slender, flexible pointapoplasm(cytology) The fluid in an apoplastapothegmA short, witty, instructive saying; an aphorism or maxim.aptagram(rare) An anagram whose meaning is relevant to that of the original text that was anagrammed.apterium(ornithology) An area of bare (featherless) skin on a bird.aptronymA name that is aptly suited to its owner.aquafarm(agriculture) A facility where aquaculture is carried out.aquariumA tank, often made of glass, for keeping live fish or other aquatic animals.aquiformResembling water; watery, liquidarchaismThe adoption or imitation of archaic words or style.arciformHaving the form of a bow (weapon)argoniumA cation (ArH⁺) formed by protonation of an argon atomargyrism(pathology) silver poisoningarkstorm(meteorology) A very severe rainstorm lasting for many days, fed by an atmospheric river, causing massive flooding.armariumSynonym of ambry (“cupboard or storage area”).armenismA word or other feature originating in the Armenian language that has been borrowed by another language.armywormThe larva of any of the genera Spodoptera and Mythimna of noctuid moths, which typically feed in large, destructive groups on food crops and grasses.arrivismAlternative form of arrivisme.arsenismarsenic poisoningarsenium(inorganic chemistry) The radical cation H₂As:⁺ derived from arsinearsonismThe tendency to commit arson.arsonium(inorganic chemistry) The univalent AsH₄⁺ cation, derived from arsine.artivismThe practice of promoting a political agenda through acts considered to be art, such as the defacing of advertisements.ascidium(botany) A pitcher-shaped or flask-shaped organ or appendage of a plant.asialism(pathology) Decrease or absence of salivary secretion; xerostomia.aspidium(dated, countable) Synonym of dryopteris: a member of a certain genus of ferns, including the male fern.asterism(astronomy) An unofficial constellation (small group of stars that forms a visible pattern).astronymThe name of a star, planet or other heavenly body.atheldom(rare) The state or condition of being athel or noble; nobility.atheneumAlternative form of athenaeum.atheniumA rejected name for einsteinium.atizoramA particular phosphodiesterase inhibitor.atropism(pathology) atropine poisoningattogram(metrology) An SI unit of mass equal to 10⁻¹⁸ grams. Symbol: agaugurismThe act of foretelling; prophecy.aurafarmAlternative form of aura farm.auriformHaving the form of the human ear; ear-shaped.ausonium(obsolete) A rejected name for neptunium. (Ausonium chemical symbol: Ao)austriumA supposed chemical element proposed by Eduard Linnemann in 1886, later found to be gallium.autogramA sentence that describes itself, in the sense of providing an inventory of its own characters.autohelmEquipment used on ships and boats to maintain a chosen course without constant human action.autoloom(India) A type of power loom.autozoom(photography) automatic zoomaxoplasmThe cytoplasm of an axon