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plutonic (adj.)

"pertaining to or involving intense heat deep in the earth's crust," 1796, coined by Irish scientist Richard Kirwin (1733-1812) from combining form of Pluto (as god of the underworld) + -ic. Especially in reference to early 19c. geological theory (championed by Hutton) that attributed most of the earth's features to action of internal heat, a theory which triumphed over its rival, neptunism, which attributed them to water. Related: Plutonism; Plutonist.

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Definitions of plutonic from WordNet

plutonic (adj.)
of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro;
Synonyms: irruptive
From wordnet.princeton.edu