a bomb of great power in which the explosive energy is derived from the nuclear fission of a fissionable material, such as plutonium or uranium-235. It is a type of nuclear weapon. The strength of an atom bomb is measured in kilotons, i.e. the equivalent energy released by explosion of a thousand tons of TNT. The first atomic bomb was manufactured in 1945.

('A' bomb) An extremely powerful bomb depending on rapid release of atomic energy. Works by fission of plutonium or uranium. (see also Hydrogen 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)

a high tech sword

An invention made to end all inventions.