fusion bomb

n.
A nuclear bomb, especially a hydrogen bomb, that derives its released energy principally from fusion reactions among light nuclei.

A bomb deriving its energy from nuclear fusion, especially a hydrogen bomb.

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The noun has one meaning:

Meaning #1: a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium
  Synonyms: hydrogen bomb, H-bomb, thermonuclear bomb

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