adjective Geology.
noting or pertaining to a class of igneous rocks that have solidified far below the earth's surface.

1790–1800; < Latin Plūtōn- (stem of Plūtō Pluto < Greek Ploútōn) + -ic; orig. referring to the Plutonic theory (see plutonism) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plutonic (pluːˈtɒnɪk)
Also: abyssal (of igneous rocks) derived from magma that has cooled and solidified below the surface of the earth
[C20: named after Pluto1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to or involving intense heat deep in the earth's crust," 1796, from Pluto (q.v.) as god of the underworld; especially in ref. to early 19c. geological theory (championed by Hutton) that attributed most of the earth's features to action of internal heat, and which
triumphed over its rival, neptunism, which attributed them to water.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Each variety of plutonic rock has its volcanic counterpart.
The cooling history and crystallization of plutonic and volcanic rocks can be explored.
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