Webster's English Dictionary

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bomb

1. bomb \'ba:m\ n [F bombe, fr. It bomba, prob. fr. L bombus deep hollow 
   sound,] fr. Gk bombos, of imit. origin 1: an explosive device fused to 
   detonate under specified conditions  2: a vessel for compressed gases  3: a 
   rounded mass of lava exploded from a volcano  4: a lead-lined container for 
   radioactive material 
2. bomb vt : to attack with bombs