From The Collaborative International Dictionary of English v.0.48:

-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.
      [1913 Webster]

   2. A suffix meaning produced, generated; as, exogen.
      [1913 Webster]
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