Thermonuclear Definition
 thûrmō-no͝oklē-ər, -nyo͝o- 
    adjective
  
 Designating or of a reaction in which isotopes of a light element, esp. hydrogen, fuse at temperatures of millions of degrees into heavier nuclei.
 Webster's New World 
Designating, of, or employing the heat energy released in nuclear fusion.
 Thermonuclear reactor.
 Webster's New World 
Relating to or characterized by the use of weapons that employ nuclear fusion, especially as distinguished from those that employ only nuclear fission.
 Thermonuclear war.
 American Heritage 
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