\Ep"i*gene\, a. [Pref. epi- + Gr. ? to be born, grow.]
1. (Crystallog.) Foreign; unnatural; unusual; -- said of
   forms of crystals not natural to the substances in which
   they are found.
2. (Geol.) Formed originating on the surface of the earth; --
   opposed to hypogene; as, epigene rocks.