n Any of the small, nocturnal, flying mammals of the order Chiroptera, which navigate by means of echolocation. They look like a mouse with membranous wings extending from the forelimbs to the hind limbs or tail. Altogether, there are about 1,000 bat species in the world.
n (context|offensive) An old woman.
n (1811) A low whore: so called from moving out like a bat in the dusk of the evening.
n A turn at hitting the ball with a bat in a game.
n (two-up|lang=en): The piece of wood on which the spinner places the coins and then uses for throwing them. (Reference: Sidney J. Baker, The Australian Language, second edition, 1966, chapter XI section 3, page 242.)