plutonic

[ploo-ton-ik] Origin

plu·ton·ic

[ploo-ton-ik]
adjective Geology.
noting or pertaining to a class of igneous rocks that have solidified far below the earth's surface.

Origin:
1790–1800; < Latin Plūtōn- (stem of Plūtō Pluto < Greek Ploútōn) + -ic; orig. referring to the Plutonic theory (see plutonism)
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Plutonic is always a great word to know.
So is soil. Does it mean:
portion of the earth's surface consisting of disintegrated rock and humus
ratio of the volume of the pores of a substance to the total volume of the mass
Collins
World English Dictionary
plutonic (pluːˈtɒnɪk)
 
adj
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
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Etymonline
Word Origin & History

plutonic
"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
EXPAND
triumphed over its rival, neptunism, which attributed them to water.
COLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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