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exo-

Origin

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

Also, ex-.

Origin:
< Greek, combining form of éxō outside

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Exo- is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Collins

World English Dictionary

exo-

—*combining form*
	external, outside, or beyond: exobiology; exothermal

[from Greek exō outside]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.

American Heritage

Science Dictionary

exo-
A prefix that means "outside" or "external," as in exoskeleton.