the part of a bridle that fits round a horse's headAlso called (esp US): headstall
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
Examples from the Web for head collar
This is a head-collar with a metal nose-band, upon the front and each side of which are stout rings.Riding and Driving|Edward L. Anderson
A strip of the same material from which the shoulder-strap was cut is tied on to the head-collar.