exo

exo-

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


Origin:
< Greek, combining form of éxō outside

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World English Dictionary
exo (ˈɛksəʊ)
 
adj
(Austral) an informal word for excellent

exo-
 
combining form
external, outside, or beyond: exobiology; exothermal
 
[from Greek exō outside]

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Etymonline
Word Origin & History

exo-
comb. form of Gk. exo "outside," used in forming scientific words, e.g. exoskeleton.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exo- pref.
Outside; external: exoskeleton.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
exo-  
A prefix that means "outside" or "external," as in exoskeleton.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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