| spirogyra | (noun) freshwater algae consisting of minute filaments containing spiral chlorophyll bands | - |
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| styracosaur | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaurus |
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| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| styrene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, vinylbenzene |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| syringa | (noun) large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes | Synonyms: mock orange, Philadelphus coronarius |
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| syringe | (noun) a medical instrument used to inject or withdraw fluids | - |
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| (verb) spray or irrigate (a body part) with a syringe | - |
| syringeful | (noun) the quantity that a syringe will hold. | - |
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| syrinx | (noun) the vocal organ of a bird | - |
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| (noun) a primitive wind instrument consisting of several parallel pipes bound together | Synonyms: pandean pipe, panpipe |
| syrup | (noun) a thick sweet sticky liquid | Synonyms: sirup |
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| syrupy | (adjective) with honey added | Synonyms: honeyed, honied |
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| (adjective) overly sweet | Synonyms: cloying, saccharine, treacly |
| (adjective) having a relatively high resistance to flow | Synonyms: viscous |
| tayra | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, taira |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| thyroglobulin | (noun) an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins | - |
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| thyroid | (adjective) suggestive of a thyroid disorder | - |
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| (adjective) of or relating to the thyroid gland | Synonyms: thyroidal |
| (noun) located near the base of the neck | Synonyms: thyroid gland |
| thyroidal | (adjective) of or relating to the thyroid gland | Synonyms: thyroid |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxic | (adjective) of or relating to or affected by hyperthyroidism | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| thyrse | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrsus |
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| thyrsopteris | (noun) a terrestrial tree fern of South America | Synonyms: Thyrsopteris elegans |
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| thyrsus | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrse |
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| tommyrot | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tosh, twaddle |
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| tributyrin | (noun) a bitter oily triglyceride of butyric acid; a form of butyrin | - |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| tyramine | (noun) amino acid derived from tyrosine; has a sympathomimetic action; found in chocolate and cola drinks and ripe cheese and beer | - |
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| tyrannic | (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, autocratic, despotic, dictatorial, tyrannical |
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| tyrannical | (adjective) marked by unjust severity or arbitrary behavior | Synonyms: oppressive, tyrannous |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: authoritarian, autocratic, despotic, dictatorial, tyrannic |
| tyrannicide | (noun) killing a tyrant | - |
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| tyrannid | (noun) a passerine bird of the suborder Tyranni | - |
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| tyrannise | (verb) rule or exercise power over (somebody) in a cruel and autocratic manner | Synonyms: domineer, tyrannize |
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| (verb) rule a country as a tyrant | Synonyms: grind down, tyrannize |
| tyrannize | (verb) rule or exercise power over (somebody) in a cruel and autocratic manner | Synonyms: domineer, tyrannise |
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| (verb) rule a country as a tyrant | Synonyms: grind down, tyrannise |
| tyrannosaur | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaurus, Tyrannosaurus rex |
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| tyrannosaurus | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaur, Tyrannosaurus rex |
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| tyrannous | (adjective) marked by unjust severity or arbitrary behavior | Synonyms: oppressive, tyrannical |
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| tyranny | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism |
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| (noun) dominance through threat of punishment and violence | Synonyms: absolutism, despotism |
| tyrant | (noun) a cruel and oppressive dictator | Synonyms: autocrat, despot |
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| (noun) any person who exercises power in a cruel way | - |
| (noun) in ancient Greece, a ruler who had seized power without legal right to it | - |
| tyre | (noun) hoop that covers a wheel | Synonyms: tire |
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| tyro | (noun) someone new to a field or activity | Synonyms: beginner, initiate, novice, tiro |
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| tyrocidin | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidine |
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| tyrocidine | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidin |
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| tyrolean | (noun) soft green felt hat with a feather or brush cockade | Synonyms: tirolean |
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| tyrosine | (noun) an amino acid found in most proteins; a precursor of several hormones | - |
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| tyrosinemia | (noun) autosomal recessive defect in tyrosine metabolism resulting in liver and kidney disturbances and mental retardation | - |
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| tyrothricin | (noun) a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria | - |
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| yr | (noun) a period of time containing 365 (or 366) days | Synonyms: twelvemonth, year |
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| zephyr | (noun) a slight wind (usually refreshing) | Synonyms: air, breeze, gentle wind |
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