'A-bomb' definitions:

Definition of 'A-bomb'

From: WordNet
noun
A nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239) [syn: atom bomb, atomic bomb, A-bomb, fission bomb, plutonium bomb]

Synonyms of 'A-bomb'

From: Moby Thesaurus