plutonic

[ 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)
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British Dictionary definitions for plutonic

plutonic

/ (pluːˈtɒnɪk) /

adjective

(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