Bat bolt (Machinery), a bolt barbed or jagged at its butt or tang to make it hold the more firmly. Knight.
Bat, v. t. [imp. & p. p. Batted (bt"td); p. pr. & vb. n. Batting.] To strike or hit with a bat or a pole; to cudgel; to beat. Holland.
Bat, v. i. To use a bat, as in a game of baseball.
Bat, n. [Corrupt. from OE. back, backe, balke; cf. Dan. aften-bakke (aften evening), Sw. natt-backa (natt night), Icel. leðr- blaka (leðr leather), Icel. blaka to flutter.] (Zoöl.) One of the Cheiroptera, an order of flying mammals, in which the wings are formed by a membrane stretched between the elongated fingers, legs, and tail. The common bats are small and insectivorous. See Cheiroptera and Vampire.
Silent bats in drowsy clusters cling.
Goldsmith.
Bat tick (Zoöl.), a wingless, dipterous insect of the genus Nycteribia, parasitic on bats.