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A xanthoma (pl. xanthomas or xanthomata) (condition: xanthomatosis), from Greek xanthos, Î¾Î±Î½Î¸Î¿Ï, yellow, is a deposition of yellowish cholesterol-rich material that can appear anywhere in the body in various disease states. xanthelasma is a sharply demarcated yellowish collection of cholesterol underneath the skin, usually on or around the eyelids. Strictly, a xanthelasma is a distinct condition, only being called a xanthoma when becoming larger and nodular, assuming tumorous proportions.
noun, Biochemistry. 1. Also called xanthophyll. a yellow-red, water-insoluble, crystalline, carotenoid alcohol, C 40 H 56 O 2 , found in the petals of marigold and certain other flowers, egg yolk, algae, and corpora lutea: used chiefly in the biochemical study of the carotenoids. 2. a preparation consisting of dried and powdered corpora lutea from hogs.