from The American Heritage® Dictionary of the English Language, 4th Edition

  • Outside; external: exoskeleton.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • outside, external

from the GNU version of the Collaborative International Dictionary of English

  • A prefix signifying out of, outside.

from The Century Dictionary and Cyclopedia

  • n. A prefix in words of Greek origin, meaning ‘without,’ ‘outside’: used chiefly in scientific compounds, where it is usually equivalent to ecto-: opposed to endo- or onto-.


From Greek exō, outside, from ex, out of; see eghs in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἔξω (exō, "outer, external"). (Wiktionary)


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