| sulfacetamide | (noun) a topical sulfonamide (trade name Sulamyd) used to treat eye infections | Synonyms: Sulamyd |
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| sulfanilamide | (noun) a white odorless crystalline sulfa drug; the parent compound of most of the sulfa drugs | - |
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| sulfide | (noun) a compound of sulphur and some other element that is more electropositive | Synonyms: sulphide |
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| sulfonamide | (noun) antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA | Synonyms: sulfa, sulfa drug, sulpha |
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| sulphide | (noun) a compound of sulphur and some other element that is more electropositive | Synonyms: sulfide |
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| superoxide | (noun) the univalent anion O2- | Synonyms: superoxide anion |
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| (noun) a metallic oxide containing the univalent anion O2- | - |
| 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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| tetrahalide | (noun) any halide containing four halogen atoms in its molecules | - |
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| tetrasaccharide | (noun) any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis | - |
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| tetroxide | (noun) an oxide containing four atoms of oxygen in the molecule | - |
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| thalidomide | (noun) a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis | - |
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| thiazide | (noun) any of a group of drugs commonly used as diuretics in the treatment of hypertension; they block the reabsorption of sodium in the kidneys | - |
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| tide | (noun) the periodic rise and fall of the sea level under the gravitational pull of the moon | - |
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| (noun) something that may increase or decrease (like the tides of the sea) | - |
| (noun) there are usually two high and two low tides each day | Synonyms: lunar time period |
| (verb) rise or move forward | Synonyms: surge |
| (verb) be carried with the tide | - |
| (verb) cause to float with the tide | - |
| tocainide | (noun) antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed | Synonyms: Tonocard |
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| tolazamide | (noun) a drug (trade name Tolinase) used in treating stable adult-onset diabetes mellitus | Synonyms: Tolinase |
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| tolbutamide | (noun) sulfonylurea; an oral antidiabetic drug (trade name Orinase) used in the treatment of adult-onset diabetes mellitus | Synonyms: Orinase |
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| topside | (noun) (usually plural) weather deck; the part of a ship's hull that is above the waterline | - |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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| (noun) any of the artificially produced elements with atomic numbers greater than 103 | - |
| trichloride | (noun) any compound containing three chlorine atoms in each molecule | - |
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| trichlormethiazide | (noun) diuretic drug (trade name Naqua) used to treat hypertension | Synonyms: Naqua |
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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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| trioxide | (noun) an oxide containing three atoms of oxygen in the molecule | - |
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| trisaccharide | (noun) any of a variety of carbohydrates that yield three monosaccharide molecules on complete hydrolysis | - |
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| tyrannicide | (noun) killing a tyrant | - |
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| underside | (noun) the lower side of anything | Synonyms: bottom, undersurface |
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| undertide | (noun) a current below the surface of a fluid | Synonyms: undercurrent |
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| upside | (noun) the highest or uppermost side of anything | Synonyms: top, top side, upper side |
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| ureide | (noun) any compound, of general formula R-CO-NH-CO-NH2 or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of urea. | - |
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| uxoricide | (noun) the murder of a wife by her husband | - |
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| (noun) a husband who murders his wife | - |
| vermicide | (noun) an agent that kills worms (especially those in the intestines) | - |
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| viricide | (noun) an agent (physical or chemical) that inactivates or destroys viruses | Synonyms: virucide |
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| virucide | (noun) an agent (physical or chemical) that inactivates or destroys viruses | Synonyms: viricide |
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| waterside | (noun) land bordering a body of water | - |
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| waveguide | (noun) a hollow metal conductor that provides a path to guide microwaves; used in radar | Synonyms: wave guide |
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| wayside | (noun) edge of a way or road or path | Synonyms: roadside |
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| westside | (adjective) of the western part of a city | - |
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| wide | (adjective) having great (or a certain) extent from one side to the other | Synonyms: broad |
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| (adjective) great in degree | - |
| (adjective) having ample fabric | Synonyms: full, wide-cut |
| (adjective) broad in scope or content | Synonyms: across-the-board, all-embracing, all-encompassing, all-inclusive, blanket, broad, encompassing, extensive, panoptic |
| (adjective) not on target | Synonyms: wide of the mark |
| (adjective) very large in expanse or scope | Synonyms: broad, spacious |
| (adjective) (used of eyes) fully open or extended | Synonyms: wide-eyed |
| (adverb) to or over a great extent or range; far | Synonyms: widely |
| (adverb) with or by a broad space | - |
| (adverb) far from the intended target | Synonyms: astray |
| (adverb) to the fullest extent possible | - |
| worldwide | (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, oecumenical, universal, world-wide |
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| (adjective) spanning or extending throughout the entire world | Synonyms: world-wide |
| (adjective) involving the entire earth; not limited or provincial in scope | Synonyms: global, planetary, world-wide, world |