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noun Atomic bomb, Atom bomb n. 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. Synonyms: A-bomb, fission bomb.
Collaborative International Dictionary of English 0.48
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