(1):

(n.) A man recently married, or about to be married; a bridegroom.

(2):

(v. i.) To tend or care for, or to curry or clean, as a, horse.

(3):

(n.) One of several officers of the English royal household, chiefly in the lord chamberlain's department; as, the groom of the chamber; the groom of the stole.

(4):

(n.) A boy or young man; a waiter; a servant; especially, a man or boy who has charge of horses, or the stable.