| 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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| zig | (noun) an angular shape characterized by sharp turns in alternating directions | Synonyms: zag, zigzag |
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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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| ziggurat | (noun) a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians | Synonyms: zikkurat, zikurat |
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| zigzag | (adjective) having short sharp turns or angles | Synonyms: zig-zag |
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| (noun) an angular shape characterized by sharp turns in alternating directions | Synonyms: zag, zig |
| (adverb) in a zigzag course or on a zigzag path | - |
| (verb) travel along a zigzag path | Synonyms: crank |
| zigzaggedness | (noun) The state or quality of being zigzagged or alternating directions sharply. | - |
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| zikkurat | (noun) a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians | Synonyms: ziggurat, zikurat |
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| zikurat | (noun) a rectangular tiered temple or terraced mound erected by the ancient Assyrians and Babylonians | Synonyms: ziggurat, zikkurat |
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| zilch | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zip, zippo |
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| zill | (noun) one of a pair of small metallic cymbals worn on the thumb and middle finger; used in belly dancing in rhythm with the dance | - |
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| zillion | (adjective) very large indeterminate number | - |
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| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, jillion, million, trillion |
| zinc | (noun) a bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs naturally as zinc sulphide in zinc blende | Synonyms: atomic number 30, Zn |
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| (verb) coat or cover with zinc | - |
| zinfandel | (noun) dry fruity red wine from California | - |
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| zing | (noun) the activeness of an energetic personality | Synonyms: dynamism, oomph, pizzaz, pizzazz |
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| (noun) a brief high-pitched buzzing or humming sound | - |
| zinger | (noun) a striking or amusing or caustic remark | - |
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| zinkenite | (noun) a steel grey metallic mineral (a sulphide of lead and antimony) | - |
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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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| zinnwaldite | (noun) a mica containing iron and lithium | - |
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| zip | (noun) a fastener for locking together two toothed edges by means of a sliding tab | Synonyms: slide fastener, zip fastener, zipper |
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| (noun) forceful exertion | Synonyms: energy, vigor, vigour |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zippo |
| (verb) close with a zipper | Synonyms: zip up, zipper |
| (verb) move very fast | Synonyms: hurry, speed, travel rapidly |
| zipper | (noun) a fastener for locking together two toothed edges by means of a sliding tab | Synonyms: slide fastener, zip, zip fastener |
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| (verb) close with a zipper | Synonyms: zip, zip up |
| zippo | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip |
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| zippy | (adjective) quick and energetic | Synonyms: alert, brisk, lively, merry, rattling, snappy, spanking |
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| (adjective) marked by lively action | Synonyms: bouncing, bouncy, peppy, spirited |
| zircon | (noun) a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent | Synonyms: zirconium silicate |
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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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| zirconium | (noun) a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon | Synonyms: atomic number 40, Zr |
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| zit | (noun) a small inflamed elevation of the skin; a pustule or papule; common symptom in acne | Synonyms: hickey, pimple |
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| zither | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: cither, zithern |
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| zithern | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: cither, zither |
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| ziti | (noun) medium-sized tubular pasta in short pieces | - |
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| zizz | (noun) a nap | - |
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| (noun) a buzzing or whizzing sound | - |