A-bomb A-bomb /ˈeɪˌbɒm/

noun

1. 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)  ( A-bomb , fission bomb , plutonium bomb , atom bomb , atomic bomb )
   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)
    The impact of the atomic bomb in Hiroshima changed the course of history.
   The impact of the atomic bomb in Hiroshima changed the course of history.