Nouns starting with X that are validated

• xanthoma disseminatum — Noun – English ～ rare chronic xanthoma of adults in which orange or brownish papules develop on many surfaces of the body
• xanthoma multiplex — Noun – English ～ widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism
• xanthomatosis — Noun – English ～ widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism
• xanthomonad — Noun – English ～ bacteria producing yellow non-water-soluble pigments; some pathogenic for plants
• Xanthomonas — Noun – English ～ a genus of bacteria similar to Pseudomonas but producing a yellow pigment that is not soluble in water
• Xanthophyceae — Noun – English ～ yellow-green algae
• xanthophyl — Noun – English ～ yellow carotenoid pigments in plants and animal fats and egg yolks
• xanthophyll — Noun – English ～ yellow carotenoid pigments in plants and animal fats and egg yolks
• xanthopsia — Noun – English ～ visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice
• Xanthorrhoeaceae — Noun – English ～ one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
• Xanthorroea — Noun – English ～ grass trees; sometimes placed in family Xanthorrhoeaceae
• xanthosis — Noun – English ～ an abnormal yellow discoloration of the skin
• Xanthosoma sagittifolium — Noun – English ～ tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes
• Xanthosoma atrovirens — Noun – English ～ tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes
• Xanthosoma — Noun – English ～ tropical American tuberous perennials
• Xantusiidae — Noun – English ～ night lizards
• Xavier — Noun – English ～ Spanish missionary and Jesuit who establish missionaries in Japan and Ceylon and the East Indies (1506-1552)
• xc — Noun – English ～ the cardinal number that is the product of ten and nine
• xe — Noun – English ～ a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
• xenarthra — Noun – English ～ armadillos; American anteaters; sloths

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