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[ploo-ton] /ˈplu tɒn/
noun, Geology.
any body of igneous rock that solidified far below the earth's surface.
Origin of pluton
1935-40; < German Pluton, back formation from plutonisch plutonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for pluton


any mass of igneous rock that has solidified below the surface of the earth
Word Origin
C20: back formation from plutonic
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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pluton in Science
A large body of igneous rock formed when a plume of magma cools and solidifies underground. Although most plutons are deep within the Earth's crust, some become exposed at the surface due to plate-tectonic processes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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