Webster's English Dictionary

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thunderbolt

thun.der.bolt \-.bo-lt\ n 1a: a single discharge of lightning with the 
   accompanying thunder  1b: an imaginary elongated mass cast as a missile to 
   earth in the lightning  flash 2a: a person or thing likened to lightning in 
   suddenness, effectiveness, or  destructive power 2b: vehement threatening 
   or censure : FULMINATION