plutonic

Of deep igneous or magmatic origin.

Of or relating to Pluto or the regions of fire; subterranean; dark

Pertaining to or designating the system of the Plutonists: as, the Plutonic theory.

In geology, formed deep below the surface.

Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.

Of, pertaining to, or designating, the system of the Plutonists; igneous.

the influence of volcanic heat and other subterranean forces under pressure.

granite, porphyry, and some other igneous rocks, supposed to have consolidated from a melted state at a great depth from the surface. Cf. Intrusive rocks, under Intrusive.

See Plutonism.

An igneous rock that cooled and hardened below the earth’s surface.