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Webster 1913 Edition

Adj.

[Cf. F.

plutonique

. See

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

Plutonic action

(Geol.)

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

–

Plutonic rocks

(Geol.)

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

–

Plutonic theory

(Geol.)

See

Adj.

[from Pluto, in mythology, the king of the infernal regions.] Pertaining to or designating the system of the Plutonists; as the Plutonic theory.