GNU Collaborative International Dictionary of English

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  1.       

    Atom bomb, Atomic 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.
    Syn. -- A-bomb, fission bomb.
    PJC

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