Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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atomic bomb a very destructive bomb; atom bomb. Its power comes from the great amount of energy released when atoms are split.
H-bomb a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb.
hydrogen bomb a very powerful type of bomb. When its hydrogen atoms are forced together under great heat and pressure, they release energy in a huge explosion.