[thur-moh-noo-klee-er, -nyoo- or, by metathesis, -kyuh-ler]
of, pertaining to, or involving a thermonuclear reaction: thermonuclear power.

1935–40; thermo- + nuclear

See nuclear. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thermonuclear (ˌθɜːməʊˈnjuːklɪə)
1.  involving nuclear fusion: a thermonuclear reaction; thermonuclear energy
2.  involving thermonuclear weapons: a thermonuclear war

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1938 with ref. 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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American Heritage
Science Dictionary
thermonuclear   (thûr'mō-n'klē-ər)  Pronunciation Key 
  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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American Heritage
Cultural Dictionary

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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Example sentences
As sun thermonuclear energy is running out, this dark region will become
  sizable, at the appointed time of the reaction.
If enough material falls onto the white dwarf, the siphoned fuel ignites a
  thermonuclear explosion.
The big laser will let scientists study thermonuclear reactions without
  detonating a bomb.
Given the destructive power of thermonuclear weapons, it's easy to understand
  why there's no room for errors.
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