| xenogeneic | (adjective) denoting or relating to cells or tissues from individuals belonging to different species | - |
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| xenogenesis | (noun) the alternation of two or more different forms in the life cycle of a plant or animal | Synonyms: alternation of generations, heterogenesis |
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| xenograft | (noun) tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species | Synonyms: heterograft |
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| xenolith | (noun) (geology) a piece of rock of different origin from the igneous rock in which it is embedded | - |
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| xenon | (noun) a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts | Synonyms: atomic number 54, Xe |
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| xenophobia | (noun) a fear of foreigners or strangers | - |
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| xenophobic | (adjective) suffering from xenophobia; having abnormal fear or hatred of the strange or foreign | - |
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| xenotime | (noun) a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form | - |
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| xenotransplant | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplantation |
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| xenotransplantation | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplant |
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| xeranthemum | (noun) any plant of the genus Xeranthemum native to southern Europe having chaffy or silvery flower heads with purplish tubular flowers | - |
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| xeric | (adjective) being deficient in moisture | - |
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| xeroderma | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xerodermia |
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| xerodermia | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xeroderma |
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| xerographic | (adjective) of or relating to xerography | - |
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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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| xeroma | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xerophthalmia, xerophthalmus |
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| xerophile | (noun) plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte | Synonyms: desert plant, xerophilous plant, xerophyte, xerophytic plant |
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| xerophthalmia | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmus |
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| xerophthalmus | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xeroma, xerophthalmia |
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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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| xerostomia | (noun) abnormal dryness of the mouth resulting from decreased secretion of saliva | Synonyms: dry mouth |
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| xerotes | (noun) the condition of not containing or being covered by a liquid (especially water) | Synonyms: dryness, waterlessness |
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| xerox | (noun) a copy made by a xerographic copier | Synonyms: xerox copy |
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| (verb) reproduce by xerography | Synonyms: photocopy, run off |