Noun
a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
Source: WordNetFor example, a boosted fission weapon is a fission bomb that increases its explosive yield through a small amount of fusion reactions, but it is not a fusion bomb. Source: Internet
In response, on 31 January 1950, President Harry S. Truman announced a crash program to develop a fusion bomb. Source: Internet