Goos'an-der, n.

n. [O. Eng. gossander, a tautological word, formed from goose and gander, q. v. Cf. MERGANSER.] (Ornith.) A migratory duck, of the genus Mergus (M. castor); the dun diver or plunger, an inhabitant of the northern regions, and feeding chiefly on fish;—called also merganser, dish-washer, and wagtail.