cavalier

(historical) A military man serving on horse, (chiefly) early modern cavalry officers who had abandoned the heavy armor of medieval knights.

(historical) A gallant: a sprightly young dashing military man.

A gentleman of the class of such officers, particularly:

(historical) A courtesan or noble under Charles I of England, particularly a royalist partisan during the English Civil War which ended his reign.

(slang) Someone with an uncircumcised penis.

(architecture) A defensive work rising from a bastion, etc., and overlooking the surrounding area.

A Cavalier King Charles Spaniel, a small breed of spaniel of English origin with a silky, smooth coat and commonly a smooth undocked tail.