Before a vowel xanth-.
Yellow.
Greek xanthos. yellow.
A xanthoma is an irregular yellow patch or nodule on the skin, caused by deposition of lipids; xanthene is a yellowish crystalline compound, whose derivatives include brilliant, often fluorescent dyes such as fluorescein; xanthophyll (Greek phullon, leaf) is a yellow or brown carotenoid plant pigment which causes the autumn colours of leaves; organic salts containing the ion ==OCS2 are xanthates, because the first example known produced a yellow precipitate with copper sulphate.
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