1. (n.) A large stick; a club; specifically, a piece of wood with one end thicker or broader than the other, used in playing baseball, cricket, etc.
2. (n.) Shale or bituminous shale.
3. (n.) A sheet of cotton used for filling quilts or comfortables; batting.
4. (n.) A part of a brick with one whole end.
5. (v. t.) To strike or hit with a bat or a pole; to cudgel; to beat.
6. (v. i.) To use a bat, as in a game of baseball.
7. (n.) 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.