combining form
or ex-
Etymology: Greek exō out of, out, outside of, outside, from ex out of — more at ex- I
1.
a. : outside
exo gamy
: outer
exo carp
exo skeleton
— opposed to end- ; compare ect-
b. : producing
ex ergonic
— opposed to end-
2. exo- , usually ital : having a 6-membered ring in its boat-shaped conformation with one or more substituents directed outward
2,5-methylene- exo -cyclohexyl-amine
— compare end- 2