[ 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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plutonic

British Dictionary definitions for plutonic


/ (pluːˈtɒnɪk) /


(of igneous rocks) derived from magma that has cooled and solidified below the surface of the earthAlso: abyssal

Word Origin for plutonic

C20: named after Pluto 1
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

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