autochanger

noun

a device in a record player that enables a small stack of records to be dropped automatically onto the turntable one at a time and played separately
a record player with such a device

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012