“+ adjective
Etymology: International Scientific Vocabulary therm- + nuclear
1. : of or relating to the transformations in the nucleus of atoms of low atomic weight (as hydrogen) that require an extraordinarily high temperature for their inception — used of the fusion of elements of low atomic weight into elements of higher atomic weight (as in the hydrogen bomb or in the sun)
thermonuclear reaction
thermonuclear weapon
2. : of, utilizing, or relating to a thermonuclear bomb
thermonuclear explosion
thermonuclear war
thermonuclear attack