| trichotillomania | (noun) an irresistible urge to pull out your own hair | - |
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| urodynia | (noun) pain during urination | - |
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| ursinia | (noun) any of various plants of the genus Ursinia grown for their yellow- or orange- or white-rayed flowers | - |
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| vaccinia | (noun) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox | Synonyms: cowpox |
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| (noun) a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar | Synonyms: vaccina, variola vaccina, variola vaccine, variola vaccinia |
| vernonia | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: ironweed |
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| zinnia | (noun) any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads | Synonyms: old maid, old maid flower |
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| zirconia | (noun) a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes | Synonyms: zirconium dioxide, zirconium oxide |
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