• synonyms


noun Geology.
  1. any body of igneous rock that solidified far below the earth's surface.
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Origin of pluton

1935–40; < German Pluton, back formation from plutonisch plutonic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pluton

Historical Examples

  • The names of the torpedo-boat destroyers were the Furor and the Pluton.

    Young Peoples' History of the War with Spain

    Prescott Holmes

  • One of our huge shells fell midway of the Pluton, which at once went down with an awful plunge.

  • The Furor and Pluton tried to fire back, but their men could not stand that iron rain.

  • Wainwright pursued the other torpedo boat, the Pluton, more vigorously.

  • While these fled, disaster fell upon the two torpedo-boat destroyers, Pluton and Furor.

British Dictionary definitions for pluton


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

pluton in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.