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sabbatism(obsolete) A period of rest, a sabbatical rest, a time of respite after death.saccharum(archaic) Invert sugar.sacciformResembling a pouchsachemdomThe government or jurisdiction of a sachem.sacrarium(anatomy) The complex sacrum of any bird.saddlebumSynonym of saddle tramp.safetyismAn obsession with keeping people safe from perceived threats.sagapenumA yellow to brown bitter gum that derives from plants of the genus Ferula.salesroom(business) The room where sales are madesalicetumA group of willow trees.salpiformResembling a salp.sandstormA strong wind carrying clouds of sand and dust through the air.sanhedrimAlternative spelling of Sanhedrin.saprobismThe condition of being saprobicsarcoderm(botany) A fleshy covering of a seed, lying between the external and internal integuments.sargassumAny of many brown algae of the genus Sargassum; gulfweedsaripidem(pharmacology) A sedative and anxiolytic drug in the imidazopyridine family.sarmentum(botany) Synonym of sarment.sarothrumAny of the stiff hairs on a bee that collect pollen.saturnism(medicine, dated) lead poisoningsavagedomA savage state or condition; savagery.savantismThe condition of being a savant.savingramA piece of administrative correspondence that uses the informal and abbreviated language of a telegram, but sent by mail, which is less expensive.saviorismBelief in a savior.scabellum(music, historical) A kind of percussion instrument played by the foot, used in dramatic performances.scalebeamThe lever or beam of a balance; the lever of a platform scale, to which the poise for weighing is applied.scalewormAny polychaete worm of the family Polynoidaescalogram(signal processing) A visual representation of a wavelet transform, having axes for time, scale, and coefficient value, analogous to a spectrogramscanogram(medicine) A radiograph produced by scanography.scapiform(botany) Resembling a scape.schediasm(archaic) cursory writing on a loose sheetscheelium(chemistry) (obsolete) tungsten (metal)schooldomThe realm or sphere of school.sciencismAlternative form of scientism.scientismThe belief that all truth is exclusively discovered through science.scobiformResembling sawdust, filings or shavings.scopiform(obsolete) Having the form of a broom.scoriformresembling scoriascreendomThe world or sphere of films and television.screwwormA larva of a blowfly of species Cochliomyia hominivorax (New World screwworm fly) or Chrysomya bezziana (Old World screwworm fly), of tribe Chrysomyini, parasitic in animals and sometimes humans, distinctive in eating living flesh of mammals, unlike most maggots, which eat only dead flesh.scribedomThe world or sphere of scribes.scutellumAny of several shield-shaped structures in insects, grasses etcscutiformHaving the shape of a shield; scutate.seabottomSynonym of seabed.sectarism(obsolete) sectarianismsedentism(anthropology) The practice of living in one place for a long time.selliformShaped like a saddle.semigloomPartial gloom or darkness.semiminim(music) A quarter note, or crotchet.sensillum(zoology) A sensory receptor in certain invertebrates, especially arthropods.sensogramAlternative form of sensorgram.sensorium(psychology) The entire sensory apparatus of an organism.separatumA separate copy of a paper originally published in an academic journal.septarium(geology) A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals.septiformHaving the form of a septum.septogramA geometric figure resembling a star with seven points; a heptagramsequanium(obsolete) An early name for the element neptunium, based on a discredited claim of discovery.serapeiumAlternative form of serapeum.serialism(music) Music, especially from the 20th century, in which themes are based on a definite order of notes of an equal-tempered scale.sermonium(historical) A historical play, formerly acted by the inferior orders of the Roman Catholic clergy.serriform(biology) notched, as the blade of a sawservilismservile behavioursexenniumA period of six years.sexorcism(uncommon) Copulation with someone who is possessed, in an attempt to drive out the spirit.sexualismThe quality of being sexual; a sex-oriented approach or focus.shaikhdomAlternative spelling of sheikdom.shamanismAny of a range of traditional beliefs and practices concerned with communication with the spirit world.sharebeam(agriculture) The part of a plough to which the share is attached.shaykhdomAlternative spelling of sheikdom.sheikhdomAlternative spelling of sheikdom.shelfroom(countable) A room fitted with shelves for storage.sheloshim(Judaism) A period of thirty days after the burial of a deceased person, during which a mourner is forbidden to do certain things, such as marrying or shaving.shitstorm(idiomatic, vulgar) Considerable backlash from the public.shochetimplural of shochetshoddydom(archaic, slang, derogatory) The realm or sphere of the shoddyites.shoddyism(colloquial) Shoddy quality or condition.shortform(advertising, of a television advertisement) Running for a relatively short time, typically no more than two minutes.shorttermUncommon form of short-term.shovelbum(US, archaeology, humorous) A professional excavator on cultural resource management projects, who has done extensive field work.sialoform(biochemistry) The form of a compound reacted with a sialic acidsialogramThe diagnostic image produced by sialography.sigmatismA defective pronunciation of sibilant sounds.signalismAn international avant-garde literary and art movement rooted in Serbian culture.simiiform(zoology) Any member of the Simiiformes.sindhuramAlternative form of sindoor.sindooramAlternative form of sindoor.singagramsinging telegramsingledomThe state or sphere of those who are single (unmarried or unattached).singleismAlternative spelling of singlism.siphonium(anatomy) A bony tube which, in some birds, connects the tympanum with the air chambers of the articular piece of the mandiblesissygasm(BDSM, slang) An orgasm reached solely through penetration of the anus, rather than by stimulation of the penis or clitoris.sisterdomsisterhood; the quality of being a sistersloganismsloganeeringsmokeroomSynonym of smoking room.snoregasmA very unsatisfying or obviously fake orgasm.snowcreamAlternative form of snow cream.snowstormBad weather involving blowing winds and snow, or blowing winds and heavy snowfall amount.socialismAny of various economic and political theories advocating collective or governmental ownership and administration of the means of production and distribution of goods.societismA social philosophy that promotes the well-being of the group without sacrificing the significance of the individual.sociogramA graphic representation of the structure of interpersonal relations in a group situation; a depiction of the social links that a person has.softmodem(computing, networking) A modem with minimal hardware capabilities, designed to use a host computer's resources to perform most of the tasks performed by dedicated hardware in a traditional modem.solipsism(philosophy) The idea that the self is all that exists or that can be proven to exist.soloecismAlternative form of solecism.somnogramA set of measurements taken by means of somnography.somnolismThe state of being in hypnotic sleepsourcreamAlternative spelling of sour cream.sozialism(non-native speakers' English) Misspelling of socialism.spacegram(science fiction) A short written message physically sent through space.sparganumThe plerocercoid larva of Spirometra tapeworms, responsible for sparganosis.specieismRare spelling of speciesism.specillumA surgical probe.spiciform(botany) spike-shapedspiderdomThe condition of being a spider; or, spiders in general.spiniformShaped like a spine.spinogramA radiograph of the spine or spinal cordspiralismThe tendency of employees to move and live in different places in line with their successive promotions.spirillumAny of various aerobic bacteria of the genus Spirillum, having an elongated spiral form and bearing a tuft of flagella.spiritdomThe sphere, realm, or world of the spirit; spirituality; spirits collectively.spiritismSpiritualism.spiroatom(organic chemistry) The connecting atom in a spiro compound.spirogramA graph of respiratory movementsplittismPolitical separatism, specifically the following of independent interests as opposed to central Communist party policy.spoonclamAny bivalve mollusc of the family PeriplomatidaespoonwormAlternative form of spoon worm.spoonyism(archaic) Foolish romantic infatuation.sporadismThe quality of being sporadic.sporidesm(botany, rare) A pluricellular body which becomes free like a simple spore, and in which every cell is capable of germination.sporidium(botany) A secondary spore borne on a promycelium, or a filament produced from a spore, in certain kinds of minute fungi.sporodermThe wall or covering of a spore.sportsdomThe world or sphere of sport.spousedomThe state or quality of being a spouse.squadrism(historical) A policy of violence by squads of Fascists in Italy after the First World War.squealdom(nonce word) Loud and noisy squealing.squiredomThe rank of squire, or the period of being a squire.stabilism(geology) Synonym of fixism.stackroomA room that houses stacks in a library.staffroomA room set aside for the use of staff.startscum(intransitive, video games, roguelikes, derogatory) To start and quit the game repeatedly in order to obtain a favourable starting situation (this being generated at random for each game).stateroomAn apartment in a palace or great house for use on ceremonial occasions.steeldrumAlternative form of steel drum.steelwormSynonym of slowwormstegostomThe posterior (innermost) portion of the stoma (oral cavity) of a nematode.stenoderm(zoology) Any of the bats resembling that of the genus Stenoderma.stenogramA work resulting from using stenography, a shorthand, a transcriptstibonium(chemistry) the univalent H₄Sb⁺ cation, derived from stibanestillroomA room containing a still (for distillation).stimulism(medicine, obsolete) The practice of treating disease by alcoholic stimulants.stockroomA room where a store keeps its stock of merchandise.stomodeum(anatomy) A depression on the ectoderm of a developing embryo that becomes the mouth.stoorwormAlternative form of stoor worm.stoponium(physics) A hypothetical bound state of a superpartner of the top quark in some supersymmetric theories.storeroomA room used for storage.storiform(sciences) In the shape of a cartwheel.stragulum(zoology) The mantle, or pallium, of a bird.stratagemA tactic or artifice designed to gain the upper hand, especially one involving underhanded dealings or deception.strategemMisspelling of stratagem.strawwormThe grub of the caddis fly.strongarmAlternative spelling of strong-arm.strontiumThe metallic chemical element (symbol Sr) with an atomic number of 38. It is a soft, reactive, silvery alkaline earth metal.strophium(historical) A band worn around the breasts, serving as a form of bra in ancient times.studygram(Internet slang) An Instagram account focused on studying or academia.styliformHaving the form of, or resembling, a bristle, pin, or pen; styloid.stylodium(botany) An elongate stigma that resembles a style.styloformSynonym of styloid.styrofoamExpanded polystyrene foam, such as is used in cups and packaging.subatriumA chamber that leads into an atriumsubbottomBeing below the bottom of something.subfandomA subdivision of a larger fandom or fan community.subiculum(botany) A felted or byssoid stratum of hyphae, bearing perithecia.submariumAn aquarium with many sea creatures.submentum(zoology) The basal part of the labium of insects, which bears the mentum.subnivium(ecology) The seasonal microenvironment beneath the snow.subphylum(taxonomy) A taxonomic category below phylum and above classsubregnum(taxonomy) A subkingdom.substream(computing) A stream contained within another stream.subsystemAlternative spelling of sub-system.subtilism(archaic) The quality or state of being subtile.subvacuum(physics) A quantum field or spacetime obtained from a vacuum by a "squeezing" processsuckerdomThe state of being a sucker, or gullible person.sudoxicam(pharmacology) A particular benzothiazine carboxamide that is a cyclooxygenase inhibitorsugarplumAlternative spelling of sugar-plum.suggestum(obsolete) A raised platform.suicidismThe quality or state of being suicidal.suitheism(rare) The belief that one is a god.sulazepam(pharmacology) A benzodiazepine drug, the thioamide derivative of diazepam.sulbactam(pharmacology) A beta-lactamase inhibitor that is usually administered in the form of its sodium salt C₈H₁₀NNaO₅S in combination with a beta-lactam antibiotic (as ampicillin).sulciformHaving the form of a sulcus.sulfeniumSynonym of sulfenylium.sulfoform(organic chemistry) Any sulfated epitope of α-glucosaminesulfonium(inorganic chemistry) the univalent H₃S⁺ cation, derived from sulfanesulopenemA beta-lactam antibiotic.sultanism(political science) An extreme form of authoritarian government characterized by the personal presence of the ruler in all elements of governance.superatom(physics, chemistry) A metamaterial, a cluster of atoms which acts like a single atom. It seems to exhibit some of the properties of elemental atoms.superbeam(rare) A very large or powerful beam (in any sense).superfarmA large commercial farm, as opposed to the traditional smaller farms owned by families.superfirmAn especially large and successful firm (business concern).superteamAny well-respected or highly successful team (in any of several contexts)superwormThe larva of the beetle Zophobas atratus, common in the pet industry as a food source for reptiles, amphibians, etc.superzoom(photography) A very high-magnification zoom feature.surfacismSuperficiality.sutteeism(archaic, Hinduism) suttee; the practice of self-immolation of Hindu widows.swarajismSupport for swaraj.syllabism(linguistics) The expression of the sounds of a language by syllables, rather than by an alphabet or by signs for words.syllogism(logic) An argument whose conclusion is supported by two premises, of which one contains the term that is the predicate of the conclusion, and the other contains the term that is the subject of the conclusion; common to both premises is a term that is excluded from the conclusion.sylvanium(obsolete) telluriumsymbolismRepresentation of a concept through symbols or underlying meanings of objects or qualities.sympodium(botany) A pattern of branching, similar to dichotomous branching, where the axis or stem is morphologically made up of a series of superposed branches imitating a simple stem.symposiumA conference or other meeting for discussion of a topic, especially one in which the participants make presentations.synangium(anatomy) The divided part beyond the pylangium in the aortic trunk of the amphibian heart.syncitiumMisspelling of syncytium.syncytium(biology) A mass of cytoplasm containing many nuclei; a multinucleate cell resulting from cell fusions of mononuclear cells (for example, the cells that make up animal skeletal muscle).synechism(philosophy) The tendency to regard things such as space, time, and law as continuous.synedriumAlternative form of synedrion.synergismThe theological doctrine that salvation is brought about by a combination of human will and divine gracesynisonym(taxonomy, rare) Any of a set of names that share a basionym.synoecism(Ancient Greece) The unification of towns, tribes etc. under one capital city or polis.synonymum(non-native speakers' English) Synonym.synsacrum(anatomy, ornithology) The bone in birds composed of the sacrum and some lumbar or caudal vertebrae fused together.