'postillion' definitions:

Definition of 'postillion'

From: WordNet
noun
Someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman) [syn: postilion, postillion]

Definition of 'postillion'

From: GCIDE
  • Postilion \Pos*til"ion\, n. [F. postillon, It. postiglione, fr. posta post. See Post a postman.] One who rides and guides the first pair of horses of a coach or post chaise; also, one who rides one of the horses when one pair only is used. [Written also postillion.] [1913 Webster]