| 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 | (noun) a consonant characterized by a hissing sound (like s or sh) | Synonyms: sibilant consonant |
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| 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 | - |
| 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 | (noun) people who are sick | - |
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| 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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| sickeningness | (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, distastefulness, nauseatingness, unsavoriness |
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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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| 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 | (noun) an extended outer surface of an object | - |
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| (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 |
| 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 |
| 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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| 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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| sidestep | (noun) a step to one side (as in boxing or dancing) | - |
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| 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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| 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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| 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 | - |
| 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 | - |
| 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 | - |
| 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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| 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 | - |
| 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 |
| 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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| sightlessness | (noun) the state of being blind or lacking sight | Synonyms: blindness, cecity |
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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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| 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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| 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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| sigmoidectomy | (noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor) | - |
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| 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 | (noun) structure displaying a board on which advertisements can be posted | Synonyms: signboard |
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| (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 | - |
| signage | (noun) signs collectively (especially commercial signs or posters) | - |
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| signal | (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signaling, signalling |
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| (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 | - |
| 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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| signalization | (noun) a conspicuous indication | Synonyms: signalisation |
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| 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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| 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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| 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 |
| signification | (noun) the message that is intended or expressed or signified | Synonyms: import, meaning, significance |
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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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| 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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