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2 definitions found
 for atom bomb
From The Collaborative International Dictionary of English v.0.48 :

  Atom bomb \At"om bomb`\, Atomic bomb \A*tom"ic 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] Atomic

From WordNet (r) 3.0 (2006) :

  atom bomb
      n 1: 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) [syn: atom bomb,
           atomic bomb, A-bomb, fission bomb, plutonium bomb]

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