| 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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