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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.
Xanthomonas campestris is an aerobic, Gram-negative rod known to cause the black rot in crucifers by darkening the vascular tissues. Host associated, over 20 different pathovars of X. campestris have been identified by their distinctive pathogenicity on a wide range of plants including crops and wild plants.