(US) The portion of a headstall that goes behind the horse's ears.[citation needed]
• (n.) A piece or part which passes over the head, as in a bridle. • (n.) A coin [In sense (b) properly crown piece.] See Crown, 19.
Crown'piece` noun (a) A piece or part which passes over the head, as in a bridle. (b) A coin [ In sense (b) properly crown piece .] See Crown , 19. 
the strap of a bridle that fits across the head of a horse. See illus. under