| vibraphone | (noun) a percussion instrument similar to a xylophone but having metal bars and rotating disks in the resonators that produce a vibrato sound | Synonyms: vibes, vibraharp |
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| vicereine | (noun) governor of a country or province who rules as the representative of his or her king or sovereign | Synonyms: viceroy |
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| (noun) wife of a viceroy | - |
| vinblastine | (noun) periwinkle plant derivative used as an antineoplastic drug (trade name Velban) that disrupts cell division | Synonyms: Velban |
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| vincristine | (noun) periwinkle plant derivative used as an antineoplastic drug (trade name Oncovin); used to treat cancer of the lymphatic system | Synonyms: Oncovin |
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| vine | (noun) a plant with a weak stem that derives support from climbing, twining, or creeping along a surface | - |
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| vinylbenzene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, styrene |
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| vitrine | (noun) a glass container used to store and display items in a shop or museum or home | Synonyms: case, display case, showcase |
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| viverrine | (noun) small cat-like predatory mammals of warmer parts of the Old World | Synonyms: viverrine mammal |
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| vulpine | (adjective) resembling or characteristic of a fox | Synonyms: vulpecular |
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| vulturine | (adjective) living by preying on other animals especially by catching living prey | Synonyms: predatory, rapacious, raptorial, ravening, vulturous |
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| waistline | (noun) the narrowing of the body between the ribs and hips | Synonyms: waist |
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| wane | (noun) a gradual decline (in size or strength or power or number) | Synonyms: ebb, ebbing |
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| (verb) become smaller | - |
| (verb) decrease in phase | - |
| (verb) grow smaller | Synonyms: decline, go down |
| warplane | (noun) an aircraft designed and used for combat | Synonyms: military plane |
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| waterborne | (adjective) supported by water | - |
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| (adjective) transported by water | - |
| waterline | (noun) a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship | Synonyms: water level, water line |
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| weathervane | (noun) mechanical device attached to an elevated structure; rotates freely to show the direction of the wind | Synonyms: vane, weather vane, wind vane |
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| whalebone | (noun) a horny material from the upper jaws of certain whales; used as the ribs of fans or as stays in corsets | Synonyms: baleen |
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| whetstone | (noun) a flat stone for sharpening edged tools or knives | - |
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| whine | (noun) a complaint uttered in a plaintive whining way | Synonyms: whimper |
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| (verb) complain whiningly | Synonyms: grizzle, yammer, yawp |
| (verb) talk in a tearful manner | Synonyms: snivel |
| (verb) move with a whining sound | - |
| (verb) make a high-pitched, screeching noise | Synonyms: creak, screak, screech, skreak, squeak |
| whinstone | (noun) any of various hard colored rocks (especially rocks consisting of chert or basalt) | Synonyms: whin |
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| windowpane | (noun) very thin translucent flounder of the Atlantic coast of North America | Synonyms: Scophthalmus aquosus |
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| (noun) a pane of glass in a window | Synonyms: window |
| wine | (noun) a red as dark as red wine | Synonyms: wine-colored, wine-coloured |
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| (noun) fermented juice (of grapes especially) | Synonyms: vino |
| (verb) drink wine | - |
| (verb) treat to wine | - |
| wishbone | (noun) the furcula of a domestic fowl | Synonyms: wishing bone |
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| woebegone | (adjective) affected by or full of grief or woe | Synonyms: woeful |
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| (adjective) worn and broken down by hard use | Synonyms: creaky, decrepit, derelict, flea-bitten, run-down |
| wolfbane | (noun) poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock | Synonyms: Aconitum lycoctonum, wolf's bane, wolfsbane |
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| wolfsbane | (noun) poisonous Eurasian perennial herb with broad rounded leaves and yellow flowers and fibrous rootstock | Synonyms: Aconitum lycoctonum, wolf's bane, wolfbane |
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| wolverine | (noun) stocky shaggy-coated North American carnivorous mammal | Synonyms: carcajou, Gulo luscus, skunk bear |
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| (noun) musteline mammal of northern Eurasia | Synonyms: glutton, Gulo gulo |
| woodbine | (noun) European twining honeysuckle with fragrant red and yellow-white flowers | Synonyms: Lonicera periclymenum |
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| (noun) common North American vine with compound leaves and bluish-black berrylike fruit | Synonyms: American ivy, Parthenocissus quinquefolia, Virginia creeper |
| xanthine | (noun) crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine | - |
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| xylene | (noun) a colorless flammable volatile liquid hydrocarbon used as a solvent | Synonyms: xylol |
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| xylophone | (noun) a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets | Synonyms: marimba |
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| zabaglione | (noun) light foamy custard-like dessert served hot or chilled | Synonyms: sabayon |
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| zalcitabine | (noun) an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI) | Synonyms: ddC, DDC, dideoxycytosine |
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| zidovudine | (noun) an antiviral drug (trade name Retrovir) used in the treatment of AIDS; adverse side effects include liver damage and suppression of the bone marrow | Synonyms: AZT, Retrovir, ZDV |
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| zigadene | (noun) any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous | Synonyms: death camas |
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| zone | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zona |
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| (noun) a locally circumscribed place characterized by some distinctive features | - |
| (noun) an area or region distinguished from adjacent parts by a distinctive feature or characteristic | - |
| (noun) any of the regions of the surface of the Earth loosely divided according to latitude or longitude | Synonyms: geographical zone |
| (verb) separate or apportion into sections | Synonyms: partition |
| (verb) regulate housing in; of certain areas of towns | Synonyms: district |
| zooecdysone | (noun) The term 'zooecdysone' refers to the molting hormones of insects. | - |
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| zygotene | (noun) the second stage of the prophase of meiosis | - |
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