Definition of exo- in English:

exo-

Pronunciation: /ˈɛksəʊ/

prefix

External; from outside: exodermis

Origin

from Greek exō 'outside'.

Definition of exo- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected