Pronunciation: (här'lu-kwin, -kin),[key] —n. 1. (often cap.) a comic character in commedia dell'arte and the harlequinade, usually masked, dressed in multicolored, diamond-patterned tights, and carrying a wooden sword or magic wand.
2. a buffoon.
3. any of various small snakes having bright diamond-pattern scales.
—adj. 1. fancifully varied in color, decoration, etc.: harlequin pants. 2. resembling a harlequin's mask: harlequin glasses.