Hypertext Webster Gateway: "plutonic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Plutonic \Plu*ton"ic\, a. [Cf. F. plutonique. See {Pluto}.]
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.
{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 {Intrusive}.
{Plutonic theory}. (Geol.) See {Plutonism}.
From WordNet (r) 1.7 (wn)
plutonic
adj : igneous rock that has solidified beneath the earth's
surface; granite or diorite or gabbro [syn: {irruptive},
{eruptive}]
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