- 1. noun /bæt/a) 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.b) An old woman.2. verb /bæt/a) to hit with a bat.
The cat batted at the toy.