Formed or situated underneath the earth's surface. Used of rocks.
Formed underground, (usually by ascending solutions).
created or crystallized at depths beneath the earth's area; -- stated of granite, gneiss, alongside stones, whose crystallization is believed of took location beneath outstanding thickness of overlying stones. Opposed to epigene.
Produced or formed under or below (the planet earth's surface); netherformed; especially, in geology, stated of rocks which have thought their current kind and structure beneath the surface; Plutonic: a term applied much more specially towards the granitic stones: opposed to epigene.