What is the meaning of Exo?

A prefix signifying out of, outside; as in exocarp, exogen, exoskeleton.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). exo. Retrieved September 23, 2026, from http://smartdefine.org/exo/definitions/2005922
ChicagoWebster's. 2011. "exo" http://smartdefine.org/exo/definitions/2005922 (accessed September 23, 2026).
HarvardWebster's 2011, exo, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/exo/definitions/2005922>.
MLAWebster's. "exo" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/exo/definitions/2005922>