Having the tail free from the interfemoral membrane to a considerable extent or entirely, as a bat; emballonurine.
The Century Dictionary (Public Domain)
Use "free-tailed" in a sentence
"In other words, the Governor is fully aware that he would be on solid scientific ground were he to designate the free-tailed bat as the official state flying mammal."
"And he knows that chiropterologists are in unanimous agreement that free-tailed bats, unlike elk, fly."
"Governor Fallin responds that she's foursquare behind him but wants in return his agreement that Utah, like Oklahoma, will designate the free-tailed bat as its official state flying mammal."