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See more synonyms for megaton on Thesaurus.com
  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