Thermonuclear

adjective

1. Relating to or derived from the fusion of atomic nuclei at high temperatures.

   "thermonuclear reactions."

2. 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."

3. Of, or relating to the fusion of atomic nuclei at high temperatures.
4. Of, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission.
5. using nuclear weapons based on fusion as distinguished from fission