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Glossary · Nouns · S

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TermTypeDefinitionClassificationsUpdated
Single-Rotor HelicopternounMWEa helicopter having a single rotorverifiedMay 18, 2026
Single-Spacingnountyping that does not leave lines blankverifiedMay 18, 2026
Single-Valued FunctionnounMWE(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)verifiedMay 18, 2026
Singlenessnounthe quality of concentrating on one central objectiveverifiedMay 18, 2026
Singlesticknouna stick used instead of a sword for fencingverifiedMay 18, 2026
Singletnouna collarless men's undergarment for the upper part of the bodyverifiedMay 18, 2026
Singletary PeanounMWEa weak-stemmed winter annual native to Mediterranean region for long established in southern United StatesverifiedMay 18, 2026
Singletonnounthe playing card that is the only card in a suit held in a bridge hand as initially dealtverifiedMay 18, 2026
Singular FormnounMWEthe form of a word that is used to denote a singletonverifiedMay 18, 2026
Singular MatrixnounMWEa square matrix whose determinant is zeroverifiedMay 18, 2026
Singularitynounstrangeness by virtue of being remarkable or unusualverifiedMay 18, 2026
Singultusnoun(usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible soundverifiedMay 18, 2026
Sinistralitynounpreference for using the left handverifiedMay 18, 2026
Sinkernouna weight that sinks (as to hold nets or fishing lines under water)verifiedMay 18, 2026
Sinkholenouna depression in the ground communicating with a subterranean passage and formed by solution or by collapse of a cavern roofverifiedMay 18, 2026
Sinkingnouna descent as through liquid, especially through waterverifiedMay 18, 2026
Sinking FeelingnounMWEa feeling caused by uneasiness or apprehensionverifiedMay 18, 2026
Sinking FundnounMWEa fund accumulated regularly in a separate account and used to redeem debt securitiesverifiedMay 18, 2026
Sinking SpellnounMWEa temporary decline in health or valueverifiedMay 18, 2026
Sinlessnessnounthe state of being unsullied by sin or moral wrongverifiedMay 18, 2026
Sinnernouna person who sins (without repenting)verifiedMay 18, 2026
Sinoatrial NodenounMWEa specialized bit of heart tissue that controls the heartbeatverifiedMay 18, 2026
Sinopernouna red ocher formerly used as a pigmentverifiedMay 18, 2026
Sinopianouna red ocher formerly used as a pigmentverifiedMay 18, 2026
Sinopisnouna red ocher formerly used as a pigmentverifiedMay 18, 2026
Sinuositynounhaving curvesverifiedMay 18, 2026
Sinuousnessnounhaving curvesverifiedMay 18, 2026
Sinusnounan abnormal passage leading from a suppurating cavity to the body surfaceverifiedMay 18, 2026
Sinus CavernosusnounMWEeither of a pair of large venous sinuses in the cranial cavityverifiedMay 18, 2026
Sinus CoronariusnounMWEa short sinus receiving most of the veins of the heartverifiedMay 18, 2026
Sinus EthmoidalesnounMWEa sinus of the meatuses of the nasal cavity (behind the bridge of the nose)verifiedMay 18, 2026
Sinus HeadachenounMWEa headache resulting from congestion or infection in the paranasal sinusesverifiedMay 18, 2026
Sinus ParanasalesnounMWEany of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavitiesverifiedMay 18, 2026
Sinus RectusnounMWEan unpaired sinus of the dura materverifiedMay 18, 2026
Sinus SigmoideusnounMWEan S-shaped dural sinus on the temporal and occipital bonesverifiedMay 18, 2026
Sinus TransversusnounMWEa paired dural sinusverifiedMay 18, 2026
Sinus Venosus ScleraenounMWEa circular canal in the eye that drains aqueous humor from the anterior chamber of the eye into the anterior ciliary veinsverifiedMay 18, 2026
Sinusitisnouninflammation of one of the paranasal sinusesverifiedMay 18, 2026
Sinusoidnountiny endothelium-lined passages for blood in the tissue of an organverifiedMay 18, 2026
Sinusoidal ProjectionnounMWEan equal-area map projection showing parallels and the equator as straight lines and other meridians as curvedverifiedMay 18, 2026
Sionnounan imaginary place considered to be perfect or idealverifiedMay 18, 2026
Siphonophorenouna floating or swimming oceanic colony of polyps often transparent or showily coloredverifiedMay 18, 2026
Sippernouna drinker who sipsverifiedMay 18, 2026
Sipunculidnounsmall unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanutverifiedMay 18, 2026
Sirnounterm of address for a manverifiedMay 18, 2026
Sirdarnounan important person in IndiaverifiedMay 18, 2026
Sirennouneellike aquatic North American salamander with small forelimbs and no hind limbsverifiedMay 18, 2026
Siren CallnounMWEthe enticing appeal of something alluring but potentially dangerousverifiedMay 18, 2026
Siren SongnounMWEthe enticing appeal of something alluring but potentially dangerousverifiedMay 18, 2026
Sireniannounany of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbsverifiedMay 18, 2026
Sirenian MammalnounMWEany of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbsverifiedMay 18, 2026
Siriasisnounsudden prostration due to exposure to the sun or excessive heatverifiedMay 18, 2026
Sirisnounlarge spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the windverifiedMay 18, 2026
Siris TreenounMWElarge spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the windverifiedMay 18, 2026
Sirloinnounthe portion of the loin (especially of beef) just in front of the rumpverifiedMay 18, 2026
Sirloin SteaknounMWEa cut of beef from the sirloinverifiedMay 18, 2026
Sirloin TipnounMWEa cut of beef from the upper end of the sirloinverifiedMay 18, 2026
Sirocconouna windstorm that lifts up clouds of dust or sandverifiedMay 18, 2026
Sirrahnounformerly a contemptuous term of address to an inferior man or boyverifiedMay 18, 2026
Sirupnouna thick sweet sticky liquidverifiedMay 18, 2026
SisalnounMexican or West Indian plant with large fleshy leaves yielding a stiff fiber used in e.g. ropeverifiedMay 18, 2026
Sisal FamilynounMWEchiefly tropical and xerophytic plants: includes Dracenaceae (Dracaenaceae)verifiedMay 18, 2026
Sisal HempnounMWEa plant fiber used for making ropeverifiedMay 18, 2026
Sisenounthe cardinal number that is the sum of five and oneverifiedMay 18, 2026
SishamnounEast Indian tree whose leaves are used for fodderverifiedMay 18, 2026
Siskinnounsmall yellow-and-black Eurasian finch with a sharp beakverifiedMay 18, 2026
Siskiyou LewisianounMWEevergreen perennial having a dense basal rosette of long spatula-shaped leaves and panicles of pink or white-and-red-striped or pink-purple flowersverifiedMay 18, 2026
Sissinessnounthe trait of being effeminate, sometimes used derogatorily of a manverifiedMay 18, 2026
SissoonounEast Indian tree whose leaves are used for fodderverifiedMay 18, 2026
SissunounEast Indian tree whose leaves are used for fodderverifiedMay 18, 2026
Sisternouna female person who is a fellow member of a sorority or labor union or other groupverifiedMay 18, 2026
Sister ShipnounMWEa ship that is one of two or more similar ships built at the same timeverifiedMay 18, 2026
Sister-In-Lawnounthe sister of your spouseverifiedMay 18, 2026
Sisterhoodnounan association or society of women who are linked together by a common religion or trade or interestverifiedMay 18, 2026
Sit-Downnouna strike in which workers refuse to leave the workplace until a settlement is reachedverifiedMay 18, 2026
Sit-Down StrikenounMWEa strike in which workers refuse to leave the workplace until a settlement is reachedverifiedMay 18, 2026
Sit-Innouna form of civil disobedience in which demonstrators occupy seats and refuse to moveverifiedMay 18, 2026
Sit-Upnouna stomach exercise in which a person sits up from a supine position without using the arms for leverageverifiedMay 18, 2026
Sitarnouna stringed instrument of IndiaverifiedMay 18, 2026
Sitar PlayernounMWEa musician who plays the sitarverifiedMay 18, 2026
Sitcomnouna humorous television program based on situations that could arise in everyday lifeverifiedMay 18, 2026
Site VisitnounMWEa visit in an official capacity to examine a site to determine its suitability for some enterpriseverifiedMay 18, 2026
Sitternouna person engaged to care for children when the parents are not homeverifiedMay 18, 2026
Sitting DucknounMWEa defenseless victimverifiedMay 18, 2026
Sitting RoomnounMWEa room in a private house or establishment where people can sit and talk and relaxverifiedMay 18, 2026
Sitting TrotnounMWEthe rider sits still in the saddleverifiedMay 18, 2026
Situationnouna condition or position in which you find yourselfverifiedMay 18, 2026
Situation ComedynounMWEa humorous television program based on situations that could arise in everyday lifeverifiedMay 18, 2026
situational awarenessnounMWEWithin a volume of time and space, the perception of an enterprise’s security posture and its threat environment; the comprehension/meaning of both taken together (risk); and the projection of their status into the near future.CapabilityMay 12, 2026
Sitz BathnounMWEa bathtub in which your buttocks and hips are immersed as if you were sitting in a chair and you bathe in a sitting positionverifiedMay 18, 2026
Six-Footernouna person who is at least six feet tallverifiedMay 18, 2026
Six-Gilled SharknounMWElarge primitive shark widely distributed in warm seasverifiedMay 18, 2026
Six-Gunnouna pistol with a revolving cylinder, usually having six chambers for bulletsverifiedMay 18, 2026
Six-Lined RacerunnernounMWEvery swift lizard of eastern and central United StatesverifiedMay 18, 2026
Six-Packnouna carton containing six bottles or cansverifiedMay 18, 2026
Six-Shooternouna pistol with a revolving cylinder (usually having six chambers for bullets)verifiedMay 18, 2026
Six-Spotnouna playing card or domino or die whose upward face shows six pipsverifiedMay 18, 2026
Sixernounthe cardinal number that is the sum of five and oneverifiedMay 18, 2026
Sixpencenouna small coin of the United Kingdom worth six penniesverifiedMay 18, 2026
Sixpenny NailnounMWEa nail 2 inches longverifiedMay 18, 2026