| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| semiarid | (adjective) somewhat arid | - |
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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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| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| stride | (noun) a step in walking or running | Synonyms: pace, tread |
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| (noun) significant progress (especially in the phrase `make strides') | - |
| (noun) the distance covered by a step | Synonyms: footstep, pace, step |
| (verb) walk with long steps | - |
| stridence | (noun) having the timbre of a loud high-pitched sound | Synonyms: shrillness, stridency |
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| stridency | (noun) having the timbre of a loud high-pitched sound | Synonyms: shrillness, stridence |
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| strident | (adjective) unpleasantly loud and harsh | Synonyms: raucous |
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| (adjective) being sharply insistent on being heard | Synonyms: shrill |
| (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: blatant, clamant, clamorous, vociferous |
| (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, sibilant, spirant |
| stridently | (adverb) in a strident manner | - |
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| strider | (noun) a person who walks rapidly with long steps | - |
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| stridor | (noun) a whistling sound when breathing (usually heard on inspiration); indicates obstruction of the trachea or larynx | - |
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| stridulate | (verb) make a shrill creaking noise by rubbing together special bodily structures | Synonyms: clitter |
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| stridulation | (noun) a shrill grating or chirping noise made by some insects by rubbing body parts together | - |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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| telluride | (noun) any binary compound of tellurium with other more electropositive elements | - |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrasaccharide | (noun) any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis | - |
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| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| thioridazine | (noun) a tranquilizer (trade name Mellaril) used to treat schizophrenia and other psychotic disorders | Synonyms: Mellaril |
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| torrid | (adjective) extremely hot and dry | - |
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| (adjective) emotionally charged and vigorously energetic | - |
| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fervid, fiery, impassioned, perfervid |
| torridity | (noun) extreme heat | - |
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| trichloride | (noun) any compound containing three chlorine atoms in each molecule | - |
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| trident | (noun) a spear with three prongs | - |
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| tridymite | (noun) a mineral form of silica | - |
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| triglyceride | (noun) glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| trisaccharide | (noun) any of a variety of carbohydrates that yield three monosaccharide molecules on complete hydrolysis | - |
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| unabridged | (adjective) (used of texts) not shortened | - |
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| (noun) a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary | Synonyms: unabridged dictionary |
| unbridgeable | (adjective) not bridgeable | - |
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| unbridle | (verb) remove the bridle from (a horse or mule) | - |
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| unbridled | (adjective) not restrained or controlled | Synonyms: unchecked, uncurbed, ungoverned |
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| veridical | (adjective) coinciding with reality | Synonyms: real |
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| viridity | (noun) green color or pigment; resembling the color of growing grass | Synonyms: green, greenness |
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| weighbridge | (noun) platform scale flush with a roadway for weighing vehicles and cattle etc | - |
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