Jack the Ripper n (Biography) an unidentified murderer who killed at least seven prostitutes in London’s East End between August and November 1888 Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014