EXO- Meaning of EXO- in English [exo-] or ex- comb form [Gk exo out, outside, fr. ex out of--more at ex-] 1: outside "exogamy": outer "exoskeleton"--compare ect-, end- 2: turning out "exoergic" Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012