| polyethylene | (noun) a lightweight thermoplastic; used especially in packaging and insulation | Synonyms: polythene |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| praiseworthy | (adjective) worthy of high praise | Synonyms: applaudable, commendable, laudable |
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| psychopathy | (noun) any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention | Synonyms: mental disease, mental illness |
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| retinopathy | (noun) a disease of the retina that can result in loss of vision | - |
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| rhinopathy | (noun) any disease or malformation of the nose | - |
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| schizothymia | (noun) resembling schizophrenia but remaining within the bounds of normality | - |
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| seaworthy | (adjective) fit for a sea voyage | - |
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| smithy | (noun) a workplace where metal is worked by heating and hammering | Synonyms: forge |
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| smoothy | (noun) someone with an assured and ingratiating manner | Synonyms: charmer, smoothie, sweet talker |
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| stealthy | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: furtive, sneak, sneaky, surreptitious |
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| swarthy | (adjective) naturally having skin of a dark color | Synonyms: dark-skinned, dusky, swart |
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| sympathy | (noun) an inclination to support or be loyal to or to agree with an opinion | Synonyms: understanding |
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| (noun) sharing the feelings of others (especially feelings of sorrow or anguish) | Synonyms: fellow feeling |
| (noun) a relation of affinity or harmony between people; whatever affects one correspondingly affects the other | - |
| telepathy | (noun) apparent communication from one mind to another without using sensory perceptions | Synonyms: thought transference |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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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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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| thylacine | (noun) rare doglike carnivorous marsupial of Tasmania having stripes on its back; probably extinct | Synonyms: Tasmanian tiger, Tasmanian wolf, Thylacinus cynocephalus |
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| thyme | (noun) leaves can be used as seasoning for almost any meat and stews and stuffings and vegetables | - |
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| (noun) any of various mints of the genus Thymus | - |
| thymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: deoxythymidine |
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| thymine | (noun) a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine | Synonyms: T |
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| thymol | (noun) a colorless crystalline solid used in perfume or preserving biological specimens or in embalming or medically as a fungicide or antiseptic | Synonyms: thyme camphor, thymic acid |
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| thymosin | (noun) hormone secreted by the thymus; stimulates immunological activity of lymphoid tissue | - |
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| thymus | (noun) a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age | Synonyms: thymus gland |
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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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| thysanopter | (noun) an insect of the order Thysanoptera | Synonyms: thysanopteron, thysanopterous insect |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| thysanuron | (noun) primitive wingless insects: bristletail | Synonyms: thysanuran insect |
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| timothy | (noun) a grass grown for hay | - |
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| (noun) grass with long cylindrical spikes grown in northern United States and Europe for hay | Synonyms: herd's grass, Phleum pratense |
| toothy | (adjective) having or showing prominent teeth | - |
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| trichloroethylene | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethane |
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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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| trustworthy | (adjective) worthy of trust or belief | Synonyms: trusty |
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| (adjective) taking responsibility for one's conduct and obligations | - |
| unairworthy | (adjective) not fit to fly | - |
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| unhealthy | (adjective) not in or exhibiting good health in body or mind | - |
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| (adjective) not conducive to good health | - |
| (adjective) detrimental to health | Synonyms: insalubrious, unhealthful |
| unseaworthy | (adjective) unfit for a voyage | - |
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| untrustworthy | (adjective) not worthy of trust or belief | Synonyms: untrusty |
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| unworthy | (adjective) lacking in value or merit | - |
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| (adjective) morally reprehensible | Synonyms: despicable, slimy, ugly, vile, worthless, wretched |
| (adjective) not deserving | Synonyms: undeserving |
| uropathy | (noun) any pathology of the urinary tract | - |
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| wealthy | (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, flush, loaded, moneyed, substantial |
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| withy | (noun) strong flexible twig | Synonyms: withe |
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| worthy | (adjective) having worth or merit or value; being honorable or admirable | - |
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| (adjective) worthy of being chosen especially as a spouse | Synonyms: desirable, suitable |
| (adjective) having qualities or abilities that merit recognition in some way | - |
| (noun) an important, honorable person (word is often used humorously) | - |