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a combining form meaning “alien,” “strange,” “guest,” used in the formation of compound words:
xenogamy, xenolith.
Also, especially before a vowel, xen-.
Origin of xeno-
combining form of Greek xénos stranger, guest (noun); alien, foreign, strange (adj.) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for xeno-


combining form
indicating something strange, different, or foreign: xenogamy
Word Origin
from Greek xenos strange
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for xeno-

before vowels, xen-, word-forming element meaning "strange, foreign; stranger, foreigner," from Greek xeno-, comb. form of xenos "a guest, stranger, foreigner" (see guest (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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xeno- in Medicine

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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