| zeal | (noun) prompt willingness | Synonyms: eagerness, forwardness, readiness |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardor, ardour, elan |
| (noun) excessive fervor to do something or accomplish some end | - |
| zealot | (noun) a fervent and even militant proponent of something | Synonyms: drumbeater, partisan |
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| zealotry | (noun) excessive intolerance of opposing views | Synonyms: fanaticism, fanatism |
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| zeaxanthin | (noun) yellow carotenoid (isomeric with lutein and occurs widely with it) that is the main pigment in yellow Indian corn | - |
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| zebibit | (noun) a unit of information equal to 1024 exbibits or 2^70 bits | Synonyms: Zibit |
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| zebibyte | (noun) a unit of information equal to 1024 exbibytes or 2^70 bytes | Synonyms: ZB, zettabyte, ZiB |
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| zebra | (noun) any of several fleet black-and-white striped African equines | - |
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| zebrawood | (noun) any of various trees or shrubs having mottled or striped wood | Synonyms: zebrawood tree |
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| (noun) handsomely striped or mottled wood of the zebrawood tree; used especially for cabinetwork | - |
| zebu | (noun) domesticated ox having a humped back and long horns and a large dewlap; used chiefly as a draft animal in India and east Asia | - |
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| zed | (noun) the 26th letter of the Roman alphabet | Synonyms: ezed, izzard, Z, z, zee |
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| zee | (noun) the 26th letter of the Roman alphabet | Synonyms: ezed, izzard, Z, z, zed |
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| zenerdiode | (noun) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator | Synonyms: stabilitron |
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| zenith | (noun) the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected | - |
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| zeolite | (noun) any of a family of glassy minerals analogous to feldspar containing hydrated aluminum silicates of calcium or sodium or potassium; formed in cavities in lava flows and in plutonic rocks | - |
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| zep | (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: bomber, Cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge |
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| zephyr | (noun) a slight wind (usually refreshing) | Synonyms: air, breeze, gentle wind |
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| zeppelin | (noun) a large rigid dirigible designed to carry passengers or bombs | Synonyms: Graf Zeppelin |
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| zero | (noun) the sight setting that will cause a projectile to hit the center of the target with no wind blowing | - |
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| (noun) the point on a scale from which positive or negative numerical quantities can be measured | Synonyms: zero point |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cipher, cypher, nought |
| (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, zilch, zip, zippo |
| zest | (noun) a tart spicy quality | Synonyms: nip, piquance, piquancy, piquantness, tang, tanginess |
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| (noun) vigorous and enthusiastic enjoyment | Synonyms: gusto, relish, zestfulness |
| zestfulness | (noun) vigorous and enthusiastic enjoyment | Synonyms: gusto, relish, zest |
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| zeta | (noun) the 6th letter of the Greek alphabet | - |
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| zettabit | (noun) a unit of information equal to 1000 exabits or 10^21 bits | Synonyms: Zb, Zbit |
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| zettabyte | (noun) a unit of information equal to 1024 exbibytes or 2^70 bytes | Synonyms: ZB, zebibyte, ZiB |
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| (noun) a unit of information equal to 1000 exabytes or 10^21 bytes | Synonyms: ZB |
| zettaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one sextillion floating-point operations a second. | Synonyms: ZFLOPS |
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| zeugma | (noun) use of a verb with two or more complements, playing on the verb's polysemy, for humorous effect | - |
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