• synonyms


  1. one million tons.
  2. an explosive force equal to that of one million tons of TNT, as that of atomic or hydrogen bombs. Abbreviation: MT
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Origin of megaton

First recorded in 1950–55; mega- + ton1
Related formsmeg·a·ton·ic [meg-uh-ton-ik] /ˌmɛg əˈtɒn ɪk/, adjectivemul·ti·meg·a·ton, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for megaton

Historical Examples

  • Larch put off another entertainment of small stuff, with a fifty megaton thermonuclear, viewscreen-piloted, among them.

    Space Viking

    Henry Beam Piper

British Dictionary definitions for megaton


  1. one million tons
  2. an explosive power, esp of a nuclear weapon, equal to the power of one million tons of TNTAbbreviation: mt
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Derived Formsmegatonic (ˌmɛɡəˈtɒnɪk), adjective
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

Word Origin and History for megaton


unit of explosive power equal to one million tons of TNT, 1952, from mega- + ton. Related: Megatonnage.

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Online Etymology Dictionary, © 2010 Douglas Harper