| x | (adjective) being one more than nine | Synonyms: 10, ten |
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| (noun) the 24th letter of the Roman alphabet | Synonyms: ex, X |
| xanthate | (noun) a salt or ester of xanthic acid | - |
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| xanthelasma | (noun) xanthoma of the eyelids; occurs chiefly in the elderly | - |
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| xanthemia | (noun) excess carotene in the blood stream; can cause the skin to turn a pale yellow or red color | Synonyms: carotenemia |
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| 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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| xanthoma | (noun) a skin problem marked by the development (on the eyelids and neck and back) of irregular yellow nodules; sometimes attributable to disturbances of cholesterol metabolism | - |
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| xanthomatosis | (noun) widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism | Synonyms: cholesterosis cutis, lipid granulomatosis, lipoid granulomatosis, xanthoma multiplex |
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| xanthomonad | (noun) bacteria producing yellow non-water-soluble pigments; some pathogenic for plants | - |
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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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| xanthopsia | (noun) visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice | - |
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| xanthosis | (noun) an abnormal yellow discoloration of the skin | - |
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| xanthous | (adjective) of the color intermediate between green and orange in the color spectrum; of something resembling the color of an egg yolk | Synonyms: yellow, yellowish |
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| xc | (adjective) being ten more than eighty | Synonyms: 90, ninety |
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| xci | (adjective) being one more than ninety | Synonyms: 91, ninety-one |
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| xcii | (adjective) being two more than ninety | Synonyms: 92, ninety-two |
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| xciii | (adjective) being three more than ninety | Synonyms: 93, ninety-three |
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| xciv | (adjective) being four more than ninety | Synonyms: 94, ninety-four |
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| xcl | (adjective) being ten more than one hundred eighty | Synonyms: 190, one hundred ninety |
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| xcv | (adjective) being five more than ninety | Synonyms: 95, ninety-five |
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| xcvi | (adjective) being six more than ninety | Synonyms: 96, ninety-six |
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| xcvii | (adjective) being seven more than ninety | Synonyms: 97, ninety-seven |
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| xcviii | (adjective) being eight more than ninety | Synonyms: 98, ninety-eight |
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| 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 |
| xi | (adjective) being one more than ten | Synonyms: 11, eleven |
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| (noun) the 14th letter of the Greek alphabet | - |
| xii | (adjective) denoting a quantity consisting of 12 items or units | Synonyms: 12, dozen, twelve |
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| xiii | (adjective) being one more than twelve | Synonyms: 13, thirteen |
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| xiv | (adjective) being one more than thirteen | Synonyms: 14, fourteen |
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| xix | (adjective) being one more than eighteen | Synonyms: 19, nineteen |
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| xl | (adjective) being ten more than thirty | Synonyms: 40, forty, twoscore |
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| xli | (adjective) being one more than forty | Synonyms: 41, forty-one |
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| xlii | (adjective) being two more than forty | Synonyms: 42, forty-two |
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| xliii | (adjective) being three more than forty | Synonyms: 43, forty-three |
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| xliv | (adjective) being four more than forty | Synonyms: 44, forty-four |
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| xlv | (adjective) being five more than forty | Synonyms: 45, forty-five |
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| xlvi | (adjective) being six more than forty | Synonyms: 46, forty-six |
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| xlvii | (adjective) being seven more than forty | Synonyms: 47, forty-seven |
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| xlviii | (adjective) being eight more than forty | Synonyms: 48, forty-eight |
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| xv | (adjective) being one more than fourteen | Synonyms: 15, fifteen |
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| xvi | (adjective) being one more than fifteen | Synonyms: 16, sixteen |
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| xvii | (adjective) being one more than sixteen | Synonyms: 17, seventeen |
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| xviii | (adjective) being one more than seventeen | Synonyms: 18, eighteen |
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| xx | (adjective) denoting a quantity consisting of 20 items or units | Synonyms: 20, twenty |
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| xxi | (adjective) being one more than twenty | Synonyms: 21, twenty-one |
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| xxii | (adjective) being two more than twenty | Synonyms: 22, twenty-two |
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| xxiii | (adjective) being three more than twenty | Synonyms: 23, twenty-three |
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| xxiv | (adjective) being four more than twenty | Synonyms: 24, twenty-four |
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| xxix | (adjective) being nine more than twenty | Synonyms: 29, twenty-nine |
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| xxv | (adjective) being five more than twenty | Synonyms: 25, twenty-five |
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| xxvi | (adjective) being six more than twenty | Synonyms: 26, twenty-six |
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| xxvii | (adjective) being seven more than twenty | Synonyms: 27, twenty-seven |
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| xxviii | (adjective) being eight more than twenty | Synonyms: 28, twenty-eight |
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| xxx | (adjective) being ten more than twenty | Synonyms: 30, thirty |
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| xxxi | (adjective) being one more than thirty | Synonyms: 31, thirty-one |
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| xxxii | (adjective) being two more than thirty | Synonyms: 32, thirty-two |
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| xxxiii | (adjective) being three more than thirty | Synonyms: 33, thirty-three |
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| xxxiv | (adjective) being four more than thirty | Synonyms: 34, thirty-four |
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| xxxv | (adjective) being five more than thirty | Synonyms: 35, thirty-five |
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| xxxvi | (adjective) being six more than thirty | Synonyms: 36, thirty-six |
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| xxxvii | (adjective) being seven more than thirty | Synonyms: 37, thirty-seven |
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| xxxviii | (adjective) being eight more than thirty | Synonyms: 38, thirty-eight |
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| xylem | (noun) the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels | - |
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| xylene | (noun) a colorless flammable volatile liquid hydrocarbon used as a solvent | Synonyms: xylol |
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| xylol | (noun) a colorless flammable volatile liquid hydrocarbon used as a solvent | Synonyms: xylene |
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| xylometer | (noun) an instrument used to determine the specific gravity of wood | - |
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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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| xylophonist | (noun) someone who plays a xylophone | - |
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| xylose | (noun) a sugar extracted from wood or straw; used in foods for diabetics | Synonyms: wood sugar |
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| xylosma | (noun) shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China | Synonyms: Xylosma congestum |
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