01 a. Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
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1.
Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
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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.