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⇱ exo- - WordReference.com Dictionary of English

- See Also:
- - existentialism
  - existing
  - exit
  - exit poll
  - exit pupil
  - exit strategy
  - exit tax
  - exitance
  - Exmoor
  - Exmouth
  - exo-
  - exobiology
  - exobiota
  - exocarp
  - exocentric
  - Exocet
  - exocrine
  - exocrine gland
  - exocrinology
  - exocytose
  - exocytosis
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exo-

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WordReference Random House Learner's Dictionary of American English © 2026

exo-, prefix.

exo- comes from Greek, where it means "outside, outer, external'': exocentric (= outside the center).Also, before a vowel, ex-.

WordReference Random House Unabridged Dictionary of American English © 2026

exo-,

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

Also, ex-.

Greek, combining form of éxō outside

Collins Concise English Dictionary © HarperCollins Publishers::

exo- combining form

external, outside, or beyond: exobiology, exothermal

Etymology: from Greek exō outside

'exo-' also found in these entries (note: many are not synonyms or translations):

ex- - exocrine - exotic - ex - exa- - exobiology - exobiota - exocarp - exocentric - exocytosis - exodermis - exoenzyme - exoergic - exoerythrocytic - exogamy - exogenetic - exogenous - exonarthex - exonumia - exopathic - exopeptidase - exoperidium - exophasia - exophora - exopodite - exopterygote - exoskeleton - exosphere - exospore - exoteric - exothermic - exotoxin - exotropia

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