atomic bombatomic bomb
an extremely destructive type of bomb, the power of which results from the immense quantity of energy suddenly released when a very rapid chain reaction of nuclear fission is set off by neutron bombardment in the atoms of a charge of plutonium (primarily Pu-239) or uranium (U-235)
An explosive weapon of great destructive power derived from the rapid release of energy in the fission of heavy atomic nuclei, especially of uranium-235 or plutonium-239. Also called A-bomb . Also called atom bomb . Also called fission bomb .