Entry 2 senses · 2 variants Webster, 1913 chiropteran · IPA n. n. 01 n. same as chiropter. 1. same as chiropter. See: chiropter Syn. chiropter; bat. 02 n. nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate. 1. nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate. Syn. bat.