Yale lock (je?l) n (Tools) trademark a type of cylinder lock using a flat serrated key[C19: after L Yale (1821?68), US inventor]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014