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exo-

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  1. a combining form meaning “outside,” “outer,” “external,” used in the formation of compound words: exocentric.
Also ex-.

Origin of exo-

< Greek, combining form of éxō outside
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for exo

Contemporary Examples

Historical Examples

  • She ran off to her typewriter, and in twelve minutes came back with the jingle, I'm glad I'm not an Exo.

    Facts in Jingles

    Winifred Sackville Stoner


British Dictionary definitions for exo

exo

adjective
  1. Australian an informal word for excellent

exo-

combining form
  1. external, outside, or beyondexobiology; exothermal

Word Origin

from Greek exō outside
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 exo

exo-

word-forming element used in scientific words (e.g. exoskeleton), from Greek exo "outside," related to ex "out of" (see ex-).

Online Etymology Dictionary, © 2010 Douglas Harper

exo in Medicine

exo-

pref.
  1. Outside; external:exoskeleton.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

exo in Science

exo-

  1. A prefix that means “outside” or “external,” as in exoskeleton.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.