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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pluton

Historical Examples of pluton

British Dictionary definitions for pluton



any mass of igneous rock that has solidified below the surface of the earth

Word Origin for pluton

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

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.