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xeno-

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

Origin of xeno-

combining form of Greek xénos stranger, guest (noun); alien, foreign, strange (adj.)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for xen-

xeno-

before a vowel xen-

combining form
  1. indicating something strange, different, or foreignxenogamy
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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

Word Origin and History for xen-

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.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

xen- in Medicine

xeno-

pref.
  1. Stranger; foreigner:xenophobia.
  2. Strange; foreign; different:xenophthalmia.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.