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The Collaborative International Dictionary of English v.0.48 (gcide)

-gen \-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. -g[`e]ne.]
1. A suffix used in scientific words in the sense of
producing, generating: as, amphigen, amidogen, halogen.
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2. A suffix meaning produced, generated; as, exogen.
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