noun
or pos·til·lion pōˈstilyən, pəˈ-
( -s )
Etymology: Middle French postillon, from Italian postiglione, from posta post — more at post (mail)
1. obsolete : postrider , postboy , courier
2. : one who rides as a guide on the near horse of a pair or of one of the pairs attached to a coach or post chaise especially without a coachman
3. : a woman's hat with a high narrow crown and a narrow rolled brim