| si | (noun) the syllable naming the seventh (subtonic) note of any musical scale in solmization | Synonyms: te, ti |
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| sial | (noun) the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum | - |
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| sialadenitis | (noun) inflammation of the salivary glands | - |
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| sialolith | (noun) a stone formed in the salivary gland | Synonyms: salivary calculus |
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| siamang | (noun) large black gibbon of Sumatra having the 2nd and 3rd toes partially united by a web | Synonyms: Hylobates syndactylus, Symphalangus syndactylus |
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| siamese | (noun) an inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into the sprinkler system of a building | Synonyms: siamese connection |
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| sib | (noun) one related by blood or origin; especially on sharing an ancestor with another | Synonyms: blood relation, blood relative, cognate |
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| (noun) a person's brother or sister | Synonyms: sibling |
| sibilant | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, fricative, spirant, strident |
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| (noun) a consonant characterized by a hissing sound (like s or sh) | Synonyms: sibilant consonant |
| sibilate | (verb) make a sharp hissing sound, as if to show disapproval | Synonyms: hiss, siss, sizz |
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| (verb) express or utter with a hiss | Synonyms: hiss, siss, sizz |
| (verb) utter a sibilant | - |
| (verb) pronounce with an initial sibilant | - |
| sibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: assibilation |
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| (noun) a fricative sound (especially as an expression of disapproval) | Synonyms: fizzle, hiss, hissing, hushing |
| sibling | (noun) a person's brother or sister | Synonyms: sib |
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| sibyl | (noun) (ancient Rome) a woman who was regarded as an oracle or prophet | - |
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| (noun) a woman who tells fortunes | - |
| sibyllic | (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibylline, vatic, vatical |
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| sibylline | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, kabbalistic, qabalistic |
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| (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibyllic, vatic, vatical |
| sic | (adverb) intentionally so written (used after a printed word or phrase) | - |
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| (verb) urge to attack someone | Synonyms: set |
| siccative | (noun) a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture) | Synonyms: desiccant, drier, drying agent |
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| sick | (adjective) affected by an impairment of normal physical or mental function | Synonyms: ill |
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| (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grim, grisly, gruesome, macabre |
| (adjective) having a strong distaste from surfeit | Synonyms: disgusted, fed up, sick of, tired of |
| (adjective) affected with madness or insanity | Synonyms: brainsick, crazy, demented, disturbed, mad, unbalanced, unhinged |
| (adjective) deeply affected by a strong feeling | - |
| (adjective) (of light) lacking in intensity or brightness; dim or feeble | Synonyms: pale, pallid, wan |
| (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sickish |
| (noun) people who are sick | - |
| (verb) eject the contents of the stomach through the mouth | Synonyms: barf, be sick, cast, cat, chuck, disgorge, honk, puke, purge, regorge, regurgitate, retch, spew, spue, throw up, upchuck, vomit, vomit up |
| sickbag | (noun) a bag provided on an airplane for passengers who are suffering from airsickness and need to vomit | Synonyms: sick bag |
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| sickbay | (noun) (nautical) a room for the treatment of the sick or injured (as on a ship) | Synonyms: sick berth |
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| sickbed | (noun) the bed on which a sick person lies | - |
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| sicken | (verb) get sick | Synonyms: come down |
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| (verb) make sick or ill | - |
| (verb) cause aversion in; offend the moral sense of | Synonyms: churn up, disgust, nauseate, revolt |
| (verb) upset and make nauseated | Synonyms: nauseate, turn one's stomach |
| sickening | (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, noisome, offensive, queasy, vile |
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| sickeningly | (adverb) in a disgusting manner or to a disgusting degree | Synonyms: disgustingly, distastefully, revoltingly |
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| sickeningness | (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, distastefulness, nauseatingness, unsavoriness |
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| sickish | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sick |
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| sickle | (noun) an edge tool for cutting grass or crops; has a curved blade and a short handle | Synonyms: reap hook, reaping hook |
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| sicklepod | (noun) North American rock cress having very long curved pods | Synonyms: Arabis Canadensis |
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| (noun) cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia | Synonyms: Cassia tora, Senna obtusifolia |
| sickliness | (noun) The state or characteristic of weakness, incapacity, or physical distress due to poor health, especially of a chronic nature. | - |
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| sickly | (adjective) somewhat ill or prone to illness | Synonyms: ailing, indisposed, peaked, poorly, seedy, under the weather, unwell |
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| (adjective) unhealthy looking | Synonyms: sallow |
| sickness | (noun) impairment of normal physiological function affecting part or all of an organism | Synonyms: illness, malady, unwellness |
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| (noun) the state that precedes vomiting | Synonyms: nausea |
| (noun) defectiveness or unsoundness | - |
| sickroom | (noun) a room to which a sick person is confined | - |
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| side | (adjective) located on a side | - |
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| (noun) an extended outer surface of an object | - |
| (noun) either the left or right half of a body | - |
| (noun) an aspect of something (as contrasted with some other implied aspect) | - |
| (noun) an opinion that is held in opposition to another in an argument or dispute | Synonyms: position |
| (noun) (sports) the spin given to a ball by striking it on one side or releasing it with a sharp twist | Synonyms: English |
| (noun) a lengthwise dressed half of an animal's carcass used for food | Synonyms: side of meat |
| (noun) one of two or more contesting groups | - |
| (noun) a family line of descent | - |
| (noun) a surface forming part of the outside of an object | Synonyms: face |
| (noun) a line segment forming part of the perimeter of a plane figure | - |
| (noun) a place within a region identified relative to a center or reference location | - |
| (noun) an elevated geological formation | Synonyms: incline, slope |
| (verb) take sides for or against | - |
| sidearm | (adjective) (of pitches) made with the arm moving parallel to the ground | - |
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| (adverb) in a sidearm manner | - |
| sidebar | (noun) (law) a courtroom conference between the lawyers and the judge that is held out of the jury's hearing | - |
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| (noun) a short news story presenting sidelights on a major story | - |
| sideboard | (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: buffet, counter |
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| (noun) a board that forms part of the side of a bed or crib | - |
| (noun) a removable board fitted on the side of a wagon to increase its capacity | - |
| sideboob | (noun) A breast exposed from the side | - |
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| sideburn | (noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off) | Synonyms: burnside, mutton chop, side-whiskers |
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| sidecar | (noun) conveyance consisting of a small carrier attached to the side of a motorcycle | - |
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| (noun) a cocktail made of orange liqueur with lemon juice and brandy | - |
| sidekick | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, chum, crony, pal |
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| sidelight | (noun) light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow | Synonyms: running light |
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| sideline | (noun) an auxiliary activity | Synonyms: avocation, by-line, hobby, pursuit, spare-time activity |
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| (noun) an auxiliary line of merchandise | - |
| (noun) a line that marks the side boundary of a playing field | Synonyms: out of bounds |
| (verb) remove from the center of activity or attention; place into an inferior position | - |
| sidelong | (adjective) inclining or directed to one side | - |
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| (adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy | Synonyms: askance, askant, asquint, squint-eyed, squint, squinty |
| (adjective) situated at or extending to the side | Synonyms: lateral |
| (adverb) to, toward or at one side | Synonyms: obliquely, sideways |
| (adverb) with the side toward someone or something | - |
| (adverb) on the side | - |
| sidereal | (adjective) (of divisions of time) determined by daily motion of the stars | - |
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| (adjective) of or relating to the stars or constellations | - |
| siderite | (noun) a meteorite consisting principally of nickel and iron | - |
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| (noun) iron ore in the form of ferrous carbonate | Synonyms: chalybite |
| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| siderocyte | (noun) an abnormal red blood cell containing granules of iron not bound in hemoglobin | - |
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| sideropenia | (noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage | - |
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| siderophilin | (noun) a globulin in blood plasma that carries iron | Synonyms: beta globulin, transferrin |
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| siderosis | (noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers | - |
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| sidesaddle | (noun) a saddle for a woman; rider sits with both feet on the same side of the horse | - |
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| (adverb) on or as if on a sidesaddle | - |
| sideshow | (noun) a minor show that is part of a larger one (as at the circus) | - |
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| (noun) a subordinate incident of little importance relative to the main event | - |
| sideslip | (noun) an unexpected slide | Synonyms: skid, slip |
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| (noun) a flight maneuver; aircraft slides sideways in the air | Synonyms: slip |
| sidesman | (noun) (Church of England) an assistant to the churchwarden; collects offerings of money in the church | - |
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| sidesplitter | (noun) a joke that seems extremely funny | Synonyms: belly laugh, howler, riot, scream, thigh-slapper, wow |
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| sidesplitting | (adjective) very funny | Synonyms: killing |
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| sidesplittingly | (adverb) in a very humorous manner | Synonyms: killingly |
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| sidestep | (noun) a step to one side (as in boxing or dancing) | - |
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| (verb) avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues) | Synonyms: circumvent, dodge, duck, elude, evade, fudge, hedge, parry, put off, skirt |
| sidestroke | (noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick | - |
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| sideswipe | (noun) a glancing blow from or on the side of something (especially motor vehicles) | - |
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| (verb) strike from the side | - |
| sidetrack | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, siding, turnout |
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| (verb) wander from a direct or straight course | Synonyms: depart, digress, straggle |
| sidewalk | (noun) walk consisting of a paved area for pedestrians; usually beside a street or roadway | Synonyms: pavement |
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| sidewall | (noun) a wall that forms the side of a structure | - |
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| (noun) the side of an automobile tire | - |
| sideward | (adverb) toward one side | Synonyms: sidewards |
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| sidewards | (adverb) toward one side | Synonyms: sideward |
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| sideway | (adverb) from the side; obliquely | Synonyms: sideways, sidewise |
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| (adverb) with one side forward or to the front | Synonyms: sideways, sidewise |
| (adverb) in a lateral direction | Synonyms: sideways, sidewise |
| sideways | (adjective) (of movement) at an angle | Synonyms: crabwise |
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| (adverb) to, toward or at one side | Synonyms: obliquely, sidelong |
| (adverb) from the side; obliquely | Synonyms: sideway, sidewise |
| (adverb) with one side forward or to the front | Synonyms: sideway, sidewise |
| (adverb) in a lateral direction | Synonyms: sideway, sidewise |
| sidewinder | (noun) small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve | Synonyms: Crotalus cerastes, horned rattlesnake |
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| (noun) air-to-air missile with infrared homing device | - |
| sidewise | (adverb) from the side; obliquely | Synonyms: sideway, sideways |
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| (adverb) with one side forward or to the front | Synonyms: sideway, sideways |
| (adverb) in a lateral direction | Synonyms: sideway, sideways |
| siding | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, sidetrack, turnout |
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| (noun) material applied to the outside of a building to make it weatherproof | - |
| sidle | (verb) move sideways | Synonyms: sashay |
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| (verb) move unobtrusively or furtively | - |
| siege | (noun) the action of an armed force that surrounds a fortified place and isolates it while continuing to attack | Synonyms: beleaguering, besieging, military blockade |
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| siemens | (noun) a unit of conductance equal to the reciprocal of an ohm | Synonyms: mho, reciprocal ohm, S |
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| sienna | (noun) an earth color containing ferric oxides; used as a pigment | - |
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| sierra | (noun) a Spanish mackerel of western North America | Synonyms: Scomberomorus sierra |
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| (noun) a range of mountains (usually with jagged peaks and irregular outline) | - |
| siesta | (noun) a nap in the early afternoon (especially in hot countries) | - |
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| sieve | (noun) a strainer for separating lumps from powdered material or grading particles | Synonyms: screen |
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| (verb) distinguish and separate out | Synonyms: sift |
| (verb) separate by passing through a sieve or other straining device to separate out coarser elements | Synonyms: sift, strain |
| (verb) check and sort carefully | Synonyms: sift |
| (verb) examine in order to test suitability | Synonyms: screen, screen out, sort |
| sift | (verb) distinguish and separate out | Synonyms: sieve |
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| (verb) separate by passing through a sieve or other straining device to separate out coarser elements | Synonyms: sieve, strain |
| (verb) check and sort carefully | Synonyms: sieve |
| (verb) move as if through a sieve | - |
| sifter | (noun) a household sieve (as for flour) | - |
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| sifting | (noun) the act of separating grain from chaff | Synonyms: winnow, winnowing |
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| sigeh | (noun) a Shiite tradition of temporary marriage permitted in Iran that allows a couple to specify the terms of their relationship; can last from a few minutes to 99 years | - |
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| sigh | (noun) an utterance made by exhaling audibly | Synonyms: suspiration |
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| (noun) a sound like a person sighing | - |
| (verb) heave or utter a sigh; breathe deeply and heavily | Synonyms: suspire |
| (verb) utter with a sigh | - |
| sight | (noun) the act of looking or seeing or observing | Synonyms: survey, view |
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| (noun) the ability to see; the visual faculty | Synonyms: vision, visual modality, visual sense |
| (noun) an instance of visual perception | - |
| (noun) the range of vision | Synonyms: ken |
| (noun) a range of mental vision | - |
| (noun) a place of interest, especially to visitors | - |
| (noun) anything that is seen | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, slew, spate, stack, tidy sum, wad |
| (verb) catch sight of; to perceive with the eyes | Synonyms: spy |
| (verb) take aim by looking through the sights of a gun (or other device) | - |
| sighted | (adjective) able to see | - |
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| sightedness | (noun) normal use of the faculty of vision | Synonyms: eyesight, seeing |
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| sighting | (noun) the act of observing | - |
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| sightless | (adjective) lacking sight | Synonyms: eyeless, unseeing |
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| sightlessness | (noun) the state of being blind or lacking sight | Synonyms: blindness, cecity |
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| sightly | (adjective) very pleasing to the eye | Synonyms: bonnie, bonny, comely, fair |
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| sightread | (verb) perform music from a score without having seen the score before | Synonyms: sight-read |
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| sightreader | (noun) a performer who reads without preparation or prior acquaintance (as in music) | - |
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| sights | (noun) an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument | - |
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| sightsee | (verb) visit famous or interesting sights | - |
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| sightseeing | (noun) going about to look at places of interest | Synonyms: rubber-necking |
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| sightseer | (noun) a tourist who is visiting sights of interest | Synonyms: excursionist, rubberneck, tripper |
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| sightsing | (verb) sing from a score without having seen it before | Synonyms: sight-sing |
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| siglum | (noun) a sign, abbreviation, letter, or character standing for words in ancient manuscripts or on coins or medals. | - |
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| sigma | (noun) the 18th letter of the Greek alphabet | - |
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| sigmoid | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoidal |
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| (adjective) curved in two directions (like the letter S) | - |
| sigmoidal | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoid |
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| sigmoidectomy | (noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor) | - |
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