Hyp"o*gene (?), a. [Pref. hypo- + the root of Gr. to be born: cf. F. hypogene.] Geol.
Formed or crystallized at depths the earth's surface; -- said of granite, gneiss, and other rocks, whose crystallization is believed of have taken place beneath a great thickness of overlying rocks. Opposed to epigene.
© Webster 1913.