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Related to epigene: Epigenetics
Formed, originating, or occurring on or just below the surface of the earth.
(Geological Science) formed or taking place at or near the surface of the earth. Compare hypogene
[C19: from French épigène, ultimately from Greek epigignesthai to be born after, from gignesthai to be born]
formed or originating on the earth's surface (opposed to hypogene): epigene rock.