- atom bomb, atomic bomb, A-bomb, fission bomb, plutonium 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)
--1 is a kind of nuclear weapon; bomb
--1 has parts: plutonium trigger, plutonium pit
--1 has particulars: clean bomb; dirty bomb; neutron bomb