thermonuclear

(t̸hʉr′mō no̵̅o̅klē ər, -nyo̵̅o̅-)

adjective

  1. designating or of a reaction in which isotopes of a light element, esp. hydrogen, fuse at temperatures of millions of degrees into heavier nuclei
  2. designating, of, or employing the heat energy released in nuclear fusion: thermonuclear reactor

Origin: thermo- + nuclear

See thermonuclear in American Heritage Dictionary 4

adjective
  1. Of, relating to, or derived from the fusion of atomic nuclei at high temperatures: thermonuclear reactions.
  2. Of, relating to, or characterized by the use of atomic weapons based on fusion, especially as distinguished from those based on fission: thermonuclear war.

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