a combining form meaning “dry,” used in the formation of compound words: xerophyte.
Also, especially before a vowel, xer-.

combining form of Greek xērós dry

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World English Dictionary
xero- or (before a vowel) xer-
combining form
indicating dryness: xeroderma
[from Greek xēros dry]
xer- or (before a vowel) xer-
combining form
[from Greek xēros dry]

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

xero- or xer-
Dry; dryness: xeroderma.

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