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[thur-moh-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler] /ˌθɜr moʊˈnu kli ər, -ˈnyu- or, by metathesis, -kyə lər/
of, relating to, or involving a thermonuclear reaction:
thermonuclear power.
Origin of thermonuclear
1935-40; thermo- + nuclear
Pronunciation note
See nuclear. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thermonuclear


involving nuclear fusion: a thermonuclear reaction, thermonuclear energy
involving thermonuclear weapons: a thermonuclear war
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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Word Origin and History for thermonuclear

1938 with reference to stars, 1953 of weapons (technically only to describe the hydrogen bomb), from thermo- + nuclear.

Online Etymology Dictionary, © 2010 Douglas Harper
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thermonuclear in Science
  1. Relating to the fusion of atomic nuclei at high temperatures or to the energy produced in this way.

  2. Relating to weapons based on nuclear fusion, especially as distinguished from those based on nuclear fission.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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thermonuclear in Culture

thermonuclear definition

A term referring to devices that use nuclear fusion, the fusion of atomic nuclei, to produce energy at very high temperatures. (See hydrogen bomb.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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