-gen

CIDE DICTIONARY

-gen,  [(1) From Gr. -gen-, from the same root as ge`nos race, stock (see Genus). (2) From Gr. suffix -genh`s born. Cf. F. -gène.].

•  A suffix used in scientific words in the sense of producing, generating: as, amphigen, amidogen, halogen.  [1913 Webster]
•  A suffix meaning produced, generated; as, exogen.  [1913 Webster]

OXFORD DICTIONARY

-gen, comb. form 1 Chem. that which produces (hydrogen; antigen).
2 Bot. growth (endogen; exogen; acrogen).

Etymology

F -g{egrave}ne f. Gk -genes -born, of a specified kind f. gen- root of gignomai be born, become