'Nuclear weapon' definitions:

Definition of 'nuclear weapon'

From: WordNet
noun
A weapon of mass destruction whose explosive power derives from a nuclear reaction [syn: nuclear weapon, atomic weapon]

Definition of 'Nuclear weapon'

From: GCIDE
  • Nuclear weapon \Nu"cle*ar wea"pon\, n. A weapon of great explosive power, such as an atomic bomb or a hydrogen bomb, which depends for most of its explosive power on the release of energy from within atomic nuclei by a nuclear reaction. A fission weapon or a fusion weapon. The term includes atomic shells for cannon. [PJC]