cheiropteran, chiropteran A mammal, such as the bat, that is a member of the order Chiroptera and has forelimbs modified as wings. The Chiroptera, or bats, are the second most diverse group of mammals, and are the only mammals ever to evolve true powered flight. The evolutionary origin of chiropterans is still somewhat of a mystery, because the fo... Found on http://www.wordinfo.info/words/index/info/view_unit/438/4