| sigmoidoscope | (noun) an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon | Synonyms: flexible sigmoidoscope |
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| sigmoidoscopy | (noun) visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps | Synonyms: flexible sigmoidoscopy |
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| sign | (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, signed |
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| (noun) structure displaying a board on which advertisements can be posted | Synonyms: signboard |
| (noun) a public display of a message | - |
| (noun) a gesture that is part of a sign language | - |
| (noun) any nonverbal action or gesture that encodes a message | Synonyms: signal, signaling, signalling |
| (noun) a character indicating a relation between quantities | - |
| (noun) a perceptible indication of something not immediately apparent (as a visible clue that something has happened) | Synonyms: mark |
| (noun) a fundamental linguistic unit linking a signifier to that which is signified | - |
| (noun) an event that is experienced as indicating important things to come | Synonyms: augury, foretoken, preindication |
| (noun) (astrology) one of 12 equal areas into which the zodiac is divided | Synonyms: house, mansion, planetary house, sign of the zodiac, star sign |
| (noun) having an indicated pole (as the distinction between positive and negative electric charges) | Synonyms: polarity |
| (noun) (medicine) any objective evidence of the presence of a disorder or disease | - |
| (verb) be engaged by a written agreement | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: signal, signalise, signalize |
| (verb) mark with one's signature; write one's name (on) | Synonyms: subscribe |
| (verb) make the sign of the cross over someone in order to call on God for protection; consecrate | Synonyms: bless |
| (verb) communicate in sign language | - |
| (verb) place signs, as along a road | - |
| (verb) approve and express assent, responsibility, or obligation | Synonyms: ratify |
| (verb) engage by written agreement | Synonyms: contract, sign on, sign up |
| signage | (noun) signs collectively (especially commercial signs or posters) | - |
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| signal | (adjective) notably out of the ordinary | - |
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| (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signaling, signalling |
| (noun) any incitement to action | - |
| (noun) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signalise, signalize |
| (verb) be a signal for or a symptom of | Synonyms: bespeak, betoken, indicate, point |
| signaler | (noun) someone who communicates by signals | Synonyms: signaller |
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| signaling | (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signal, signalling |
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| signalisation | (noun) a conspicuous indication | Synonyms: signalization |
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| signalise | (verb) make conspicuous or noteworthy | Synonyms: distinguish, signalize |
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| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signal, signalize |
| (verb) point out carefully and clearly | Synonyms: call attention, point out, signalize |
| (verb) provide with traffic signals | Synonyms: signalize |
| signalization | (noun) a conspicuous indication | Synonyms: signalisation |
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| signalize | (verb) make conspicuous or noteworthy | Synonyms: distinguish, signalise |
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| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signal, signalise |
| (verb) point out carefully and clearly | Synonyms: call attention, point out, signalise |
| (verb) provide with traffic signals | Synonyms: signalise |
| signaller | (noun) someone who communicates by signals | Synonyms: signaler |
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| signalling | (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signal, signaling |
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| signally | (adverb) in a signal manner | Synonyms: remarkably, unmistakably |
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| (adverb) as a signal | - |
| signalman | (noun) a railroad employee in charge of signals and point in a railroad yard | - |
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| signatory | (noun) someone who signs and is bound by a document | Synonyms: signer |
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| signature | (noun) a distinguishing style | Synonyms: touch |
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| (noun) your name written in your own handwriting | - |
| (noun) a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book | - |
| (noun) the sharps or flats that follow the clef and indicate the key | Synonyms: key signature |
| (noun) a melody used to identify a performer or a dance band or radio/tv program | Synonyms: signature tune, theme song |
| signboard | (noun) structure displaying a board on which advertisements can be posted | Synonyms: sign |
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| signed | (adjective) having a handwritten signature | - |
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| (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, sign |
| signer | (noun) someone who signs and is bound by a document | Synonyms: signatory |
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| (noun) someone who can use sign language to communicate | - |
| signet | (noun) a seal (especially one used to mark documents officially) | - |
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| significance | (noun) the quality of being significant | - |
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| (noun) a meaning that is not expressly stated but can be inferred | Synonyms: implication, import |
| (noun) the message that is intended or expressed or signified | Synonyms: import, meaning, signification |
| significant | (adjective) important in effect or meaning | Synonyms: important |
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| (adjective) too closely correlated to be attributed to chance and therefore indicating a systematic relation | - |
| (adjective) of considerable importance, size, or worth | Synonyms: substantial |
| (adjective) rich in significance or implication | Synonyms: meaning, pregnant |
| significantly | (adverb) in an important way or to an important degree | Synonyms: importantly |
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| (adverb) in a significant manner | - |
| (adverb) in a statistically significant way | - |
| signification | (noun) the message that is intended or expressed or signified | Synonyms: import, meaning, significance |
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| significative | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, suggestive |
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| signified | (noun) the meaning of a word or expression; the way in which a word or expression or situation can be interpreted | Synonyms: sense |
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| signifier | (noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify something | Synonyms: descriptor, form, word form |
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| signify | (verb) convey or express a meaning | - |
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| (verb) make known with a word or signal | - |
| (verb) denote or connote | Synonyms: intend, mean, stand for |
| signing | (noun) language expressed by visible hand gestures | Synonyms: sign language |
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| signior | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signor |
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| signor | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signior |
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| signora | (noun) an Italian title of address equivalent to Mrs. when used before a name | - |
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| signore | (noun) an Italian title of respect for a man; equivalent to the English `sir'; used separately (not prefixed to his name) | - |
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| signorina | (noun) an Italian courtesy title for an unmarried woman; equivalent to `Miss', it is either used alone or before a name | - |
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| signory | (noun) the estate of a seigneur | Synonyms: seigneury, seigniory |
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| signpost | (noun) a post bearing a sign that gives directions or shows the way | Synonyms: guidepost |
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| (verb) mark with a signpost, as of a path | - |
| sika | (noun) small deer of Japan with slightly forked antlers | Synonyms: Cervus nippon, Cervus sika, Japanese deer |
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| silage | (noun) fodder harvested while green and kept succulent by partial fermentation as in a silo | Synonyms: ensilage |
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| sild | (noun) any of various young herrings (other than brislings) canned as sardines in Norway | - |
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| sildenafil | (noun) virility drug (trade name Viagra) used to treat erectile dysfunction in men | Synonyms: sildenafil citrate, Viagra |
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| silence | (noun) the absence of sound | Synonyms: quiet |
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| (noun) a refusal to speak when expected | Synonyms: muteness |
| (noun) the trait of keeping things secret | Synonyms: secrecy, secretiveness |
| (noun) the state of being silent (as when no one is speaking) | - |
| (verb) cause to be quiet or not talk | Synonyms: hush, hush up, quieten, shut up, still |
| (verb) keep from expression, for example by threats or pressure | - |
| silenced | (adjective) reduced to silence | - |
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| silencer | (noun) a tubular acoustic device inserted in the exhaust system that is designed to reduce noise | Synonyms: muffler |
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| (noun) short tube attached to the muzzle of a gun that deadens the sound of firing | - |
| silene | (noun) any plant of the genus Silene | Synonyms: campion, catchfly |
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| silent | (adjective) implied by or inferred from actions or statements | Synonyms: tacit, understood |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: dumb, mute |
| (adjective) having a frequency below or above the range of human audibility | - |
| (adjective) marked by absence of sound | Synonyms: soundless, still |
| (adjective) failing to speak or communicate etc when expected to | Synonyms: mum |
| (adjective) not made to sound | Synonyms: unsounded |
| (adjective) expressed without speech | Synonyms: mute, tongueless, unspoken, wordless |
| silently | (adverb) without speaking | Synonyms: mutely, taciturnly, wordlessly |
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| silents | (noun) a movie without a soundtrack | Synonyms: silent movie, silent picture |
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| silenus | (noun) any of the minor woodland deities who were companions of Dionysus (similar to the satyrs) | - |
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| silesia | (noun) a sturdy twill-weave cotton fabric; used for pockets and linings | - |
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| silex | (noun) a pure form of finely ground silica | - |
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| silhouette | (noun) a drawing of the outline of an object; filled in with some uniform color | - |
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| (noun) an outline of a solid object (as cast by its shadow) | - |
| (verb) represent by a silhouette | - |
| (verb) project on a background, such as a screen, like a silhouette | - |
| silica | (noun) a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite | Synonyms: silicon dioxide, silicon oxide |
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| silicate | (noun) a salt or ester derived from silicic acid | - |
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| siliceous | (adjective) relating to or containing or resembling silica | Synonyms: silicious |
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| silicide | (noun) any of various compounds of silicon with a more electropositive element or radical | - |
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| silicious | (adjective) relating to or containing or resembling silica | Synonyms: siliceous |
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| silicle | (noun) short broad silique occurring in some cruciferous plants | - |
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| silicon | (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors | Synonyms: atomic number 14, Si |
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| silicone | (noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation | Synonyms: silicone polymer |
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| silicosis | (noun) a lung disease caused by inhaling particles of silica or quartz or slate | - |
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| siliqua | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: silique |
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| silique | (noun) narrow elongated seed capsule peculiar to the family Cruciferae | Synonyms: siliqua |
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| silk | (noun) a fabric made from the fine threads produced by certain insect larvae | - |
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| (noun) animal fibers produced by silkworms and other larvae that spin cocoons and by most spiders | - |
| silken | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silklike, silky, sleek, slick |
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| silkgrass | (noun) valuable forage grass of dry upland areas and plains of western North America to northern Mexico | Synonyms: Indian millet, mountain rice, Oryzopsis hymenoides, silk grass |
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| silkily | (adverb) in a silky manner | - |
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| silkiness | (noun) the smooth feel of silk fabric | Synonyms: sleekness |
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| silklike | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silken, silky, sleek, slick |
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| silks | (noun) the brightly colored garments of a jockey; emblematic of the stable | - |
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| silkscreen | (noun) a print made using a stencil process in which an image or design is superimposed on a very fine mesh screen and printing ink is squeegeed onto the printing surface through the area of the screen that is not covered by the stencil | Synonyms: serigraph, silk screen print |
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| (verb) print by silkscreen | - |
| silkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: milkweed |
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| silkwood | (noun) a fast-growing tropical American evergreen having white flowers and fleshy edible fruit; a bark yields a silky fiber used in cordage and wood is valuable for staves | Synonyms: calabur tree, calabura, Jamaican cherry, Muntingia calabura, silk wood |
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| silkworm | (noun) the commercially bred hairless white caterpillar of the domestic silkworm moth which spins a cocoon that can be processed to yield silk fiber; the principal source of commercial silk | - |
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| (noun) larva of a saturniid moth; spins a large amount of strong silk in constructing its cocoon | Synonyms: giant silkworm, wild wilkworm |
| silky | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silken, silklike, sleek, slick |
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| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| sillabub | (noun) sweetened cream beaten with wine or liquor | Synonyms: syllabub |
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| (noun) spiced hot milk with rum or wine | Synonyms: syllabub |
| silliness | (noun) a ludicrous folly | Synonyms: absurdity, fatuity, fatuousness |
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| (noun) an impulsive scatterbrained manner | Synonyms: giddiness |
| silly | (adjective) dazed from or as if from repeated blows | Synonyms: punch-drunk, slaphappy |
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| (adjective) ludicrous, foolish | Synonyms: goofy, wacky, whacky, zany |
| (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded |
| (adjective) inspiring scornful pity | Synonyms: pathetic, ridiculous |
| (noun) a word used for misbehaving children | - |
| silo | (noun) a cylindrical tower used for storing silage | - |
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| (noun) military installation consisting of an underground structure where ballistic missiles can be stored and fired | - |
| siloxane | (noun) any of a large class of compounds that have alternate silicon and oxygen atoms | - |
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| silt | (noun) mud or clay or small rocks deposited by a river or lake | - |
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| (verb) become chocked with silt | Synonyms: silt up |
| siltstone | (noun) a fine-grained sandstone of consolidated silt | - |
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| silty | (adjective) full of silt | - |
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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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| silva | (noun) the forest trees growing in a country or region | Synonyms: sylva |
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| silvan | (adjective) relating to or characteristic of wooded regions | Synonyms: sylvan |
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| (noun) a spirit that lives in or frequents the woods | Synonyms: sylvan |
| silver | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: argent, silverish, silvery |
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| (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, facile, fluent, silver-tongued, smooth-spoken |
| (adjective) having the white lustrous sheen of silver | Synonyms: silvern, silvery |
| (adjective) made from or largely consisting of silver | - |
| (noun) silverware eating utensils | Synonyms: flatware |
| (noun) a trophy made of silver (or having the appearance of silver) that is usually awarded for winning second place in a competition | Synonyms: silver medal |
| (noun) a light shade of grey | Synonyms: ash gray, ash grey, silver gray, silver grey |
| (noun) coins made of silver | - |
| (noun) a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography | Synonyms: Ag, atomic number 47 |
| (verb) make silver in color | - |
| (verb) turn silver | - |
| (verb) coat with a layer of silver or a silver amalgam | - |
| silverback | (noun) an adult male gorilla with grey hairs across the back | - |
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| silverberry | (noun) deciduous unarmed North American shrub with silvery leaves and fruits | Synonyms: Elaeagnus commutata, silver-bush, silver berry, silverbush |
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| silverbush | (noun) deciduous unarmed North American shrub with silvery leaves and fruits | Synonyms: Elaeagnus commutata, silver-bush, silver berry, silverberry |
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| (noun) silvery hairy European shrub with evergreen foliage and pale yellow flowers | Synonyms: Anthyllis barba-jovis, Jupiter's beard, silver-bush |
| silverfish | (noun) a silvery variety of Carassius auratus | - |
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| (noun) silver-grey wingless insect found in houses feeding on book bindings and starched clothing | Synonyms: Lepisma saccharina |
| silverish | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: argent, silver, silvery |
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| silvern | (adjective) having the white lustrous sheen of silver | Synonyms: silver, silvery |
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| (adjective) resembling or reminiscent of silver | Synonyms: silvery |
| silverplate | (verb) plate with silver | Synonyms: silver-plate |
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| silverpoint | (noun) a drawing made on specially prepared paper with an instrument having a silver tip (15th and 16th centuries) | - |
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| silverrod | (noun) plant of eastern North America having creamy white flowers | Synonyms: Solidago bicolor |
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| silverside | (noun) small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States | Synonyms: silversides |
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| silversides | (noun) small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States | Synonyms: silverside |
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| (noun) the common North American shiner | Synonyms: common shiner, Notropis cornutus |
| silversmith | (noun) someone who makes or repairs articles of silver | Synonyms: silver-worker, silverworker |
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