Thermonuclear Thermonuclear refers to the energy released by the thermonuclear reaction. The thermonuclear weapon, nuclear bomb involving thermonuclear energy. (The power of thermonuclear weapons is expressed in megatons.) Also called hydrogen weapon or H weapon. Thermonuclear reaction, nuclear reaction of fusion of the nuclei of light atoms brought to a very high temperature. Understanding the … Continue reading Thermonuclear: Fusion, Weapon and History