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[ploo-ton-ik] /pluˈtɒn ɪk/
adjective, Geology.
noting or pertaining to a class of igneous rocks that have solidified far below the earth's surface.
Origin of plutonic
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. 2018.
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British Dictionary definitions for plutonic


(of igneous rocks) derived from magma that has cooled and solidified below the surface of the earth Also abyssal
Word Origin
C20: named after Pluto1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for plutonic

"pertaining to or involving intense heat deep in the earth's crust," 1796, coined by Irish scientist Richard Kirwin (1733-1812) from comb. 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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