a combining form meaning “alien,” “strange,” “guest,” used in the formation of compound words: xenogamy, xenolith.
Also, especially before a vowel, xen-.

combining form of Greek xénos stranger, guest (noun); alien, foreign, strange (adj.)

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World English Dictionary
xeno- or (before a vowel) xen-
combining form
indicating something strange, different, or foreign: xenogamy
[from Greek xenos strange]
xen- or (before a vowel) xen-
combining form
[from Greek xenos strange]

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

xeno- or xen-

  1. Stranger; foreigner: xenophobia.

  2. Strange; foreign; different: xenophthalmia.

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