Longman Dictionary of Contemporary English
Wiktionary
n. An atomic bomb that uses nuclear fusion as a source of energy; a hydrogen bomb
WordNet
n. a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium [syn: hydrogen bomb, H-bomb, thermonuclear bomb]
Usage examples of "fusion bomb".
Even better, a bolt that passed down the cannon's bore would detonate the shell out of sequence, turning it into a miniature fusion bomb instead of a directed-energy weapon.
There are three types of nuclear devices, the atomic bomb, the hydrogen or H-bomb, and the pure-fusion bomb.
Once I had his attention Holmes was focused on the problem like a laser beam, and he outlined several possible technologies, the least attractive being launching a ship by detonating a fusion bomb underneath it.
Brennan took a handhold at the rim of a fusion bomb's rocket nozzle.
The basic drive was to the kzinti gravity polarizer as a fusion bomb was to a grenade—.
It is a fusion bomb which creates a chain reaction between these two: heavy hydrogen and super-heavy hydrogen.
Maybe he'll decide that takes too long and just use a fusion bomb.