Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
a-bomb is a noun meaning "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)". It carries one recorded sense.
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)
Definitions, synonyms and semantic relations for a-bomb come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.