Definition of Jack the Ripper from the Oxford Advanced Learner's Dictionary

 

Jack the Ripper

 
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the name given to an unknown man who murdered and cut up several prostitutes in Whitechapel, London, in 1888. The name was used in a letter by someone who claimed to be the killer but may have been a journalist. People have tried ever since to find out who he was, but without success. There have been many novels, plays and films about the murders.