a-bomb n 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) Synonym(s) atom bomb atomic bomb A-bomb fission bomb plutonium bomb
News & Articles a-bomb Today in history: July 24 President Martin Van Buren dies, FDR makes a daring demand, and rumors of the A-bomb circulate at Potsdam July 24, 2013 - The Week via Yahoo! News