Definition of exo- in English:

exo-

Pronunciation: /ˈɛksəʊ/

prefix

  • External; from outside: exodermis

Origin

from Greek exō 'outside'.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space