Stoat \Stoat\, n. [OE. stot a stoat, horse, bullock; perhaps originally only of male animals, and akin to D. stooten to push, E. stutter; cf. Icel. st?tr a bull, Sw. stut a bullock. Cf. {Stot}.] (Zo["o]l.) The ermine in its summer pelage, when it is reddish brown, but with a black tip to the tail. The name is sometimes applied also to other brown weasels. [1913 Webster]