Definitions for "Plutonic"
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; as, the Plutonic theory.
(ploo tahn' ic) - Igneous rocks that form from the cooling of magma in the interior of a planet or asteroid.