Meaning

noun nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate

noun (baseball) a turn trying to get a hit

noun a small racket with a long handle used for playing squash

originFrom Middle English bat, batte, from Old English batt (“bat, club, cudgel”), probably of Celtic origin, compare Old Breton bath (“club, cudgel”) and modern Breton bazh (“swagger stick”), ultimately from a derivative of Proto-Indo-European *bʰedʰh₂- (“to strike, beat, pierce”), similar to the Gaulish source of Latin battuō (“to beat, pound”).

Etymology from Wiktionary, CC BY-SA 3.0