GNU Collaborative International Dictionary of English

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1.       
   H-bomb (āchˈbŏmbˌ) n. The hydrogen bomb, a thermonuclear weapon that releases atomic energy by union of hydrogen nuclei at high temperatures to form helium.  The force of its explosion may range from one to hundreds of megatons of TNT equivalent.
   
   Syn. -- hydrogen bomb, fusion bomb, thermonuclear bomb.
   
   [WordNet 1.5 +PJC]