Flying lemur \Fly"ing le"mur\ (Zool.) either of two nocturnal lemurlike mammals inhabiting the East Indies ({Cynocephalus variegatus}) or the Phillipines ({Cynocephalus volans}) having broad folds of skin between the fore and hind limbs on both sides of the body allowing them to make long gliding leaps; they have been classed in the separate order {Dermoptera}. They are arboreal and have become rare. [PJC]