a combining form meaning “yellow,” used in the formation of compound words: xanthophyll.
Also, especially before a vowel, xanth-.

combining form of Greek xanthós yellow

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World English Dictionary
xantho- or (before a vowel) xanth-
combining form
indicating yellow: xanthophyll
[from Greek xanthos yellow]
xanth- or (before a vowel) xanth-
combining form
[from Greek xanthos yellow]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

xantho- or xanth-
Yellow: xanthochromia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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