Plutonic /(?)/

Plu·ton·ic

Plutonic

a.
  1. Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
  2. Of, pertaining to, or designating, the system of the Plutonists; igneous; as, the Plutonic theory.

Phrases & Compounds
Plutonic action
the influence of volcanic heat and other subterranean forces under pressure.
Plutonic rocks
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.
Plutonic theory
See Plutonism.