noun Geology.
the intrusion of magma and associated deep-seated processes within the earth's crust.
(often initial capital letter) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97).

1840–50; pluton(ic) + -ism

plutonist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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