| venography | (noun) roentgenographic examination of veins | - |
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| xanthophyl | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyll |
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| xanthophyll | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyl |
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| xerography | (noun) forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas | - |
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| xerophyte | (noun) plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte | Synonyms: desert plant, xerophile, xerophilous plant, xerophytic plant |
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| xerophytic | (adjective) adapted to a xeric (or dry) environment | - |
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| xeroradiography | (noun) radiography using X-rays and xerographic (rather than roentgenographic) techniques | - |
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| zephyr | (noun) a slight wind (usually refreshing) | Synonyms: air, breeze, gentle wind |
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| zoophyte | (noun) any of various invertebrate animals resembling a plant such as a sea anemone or coral or sponge | - |
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