What does "bat" mean?

Additional senses

1. 2.A sheet of cotton used for filling quilts or comfortables; batting.
2. 3.A part of a brick with one whole end. Bat bolt (Machinery), a bolt barbed or jagged at its butt or tang to make it hold the more firmly. Knight.
3. 4.To strike or hit with a bat or a pole; to cudgel; to beat. Holland.
4. 5.To use a bat, as in a game of baseball.
5. 6.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. Bat tick (Zoöl.), a wingless, dipterous insect of the genus Nycteribia, parasitic on bats.