| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| twentieth | (adjective) coming next after the nineteenth in position | Synonyms: 20th |
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| (noun) position 20 in a countable series of things | - |
| umptieth | (adjective) last in an indefinitely numerous series | Synonyms: umpteenth, umteenth |
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| unethical | (adjective) not conforming to approved standards of social or professional behavior | - |
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| unethically | (adverb) in an unethical manner | - |
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| unforethoughtful | (adjective) lacking forethought | - |
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| unmethodical | (adjective) not efficient or methodical | - |
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| untethered | (adjective) not confined or restricted with a tether | - |
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| urethane | (noun) an ester of carbamic acid | - |
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| urethra | (noun) duct through which urine is discharged in most mammals and which serves as the male genital duct | - |
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| urethral | (adjective) of or relating to the urethra | - |
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| urethritis | (noun) inflammation of the urethra; results in painful urination | - |
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| urethrocele | (noun) prolapse of the urethra into the vagina | - |
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| wether | (noun) male sheep especially a castrated one | - |
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| whitethorn | (noun) thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America | Synonyms: Crataegus laevigata, Crataegus oxycantha, English hawthorn, may |
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| whitethroat | (noun) common North American finch with a white patch on the throat and black-and-white striped crown | Synonyms: white-throated sparrow, Zonotrichia albicollis |
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| (noun) greyish-brown Old World warbler with a white throat and underparts | Synonyms: greater whitethroat, Sylvia communis |
| (noun) Old World warbler similar to the greater whitethroat but smaller | Synonyms: lesser whitethroat, Sylvia curruca |