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exo-(word root) outside, external
Examples of words with the root exo-: exocentric
Outside; external: exoskeleton.
external, outside, or beyond: exobiology; exothermal.
[from Greek exō outside]
a combining form meaning “outside,” “outer,” “external”: exocentric. Also, before a vowel, ex-.
[< Greek, comb. form of éxō outside]
A prefix that means "outside" or "external," as in exoskeleton.