Definitions for "Flying squirrel"
One of a group of squirrels, of the genus Glaucomys (formerly Pteromus and Sciuropterus [1913 Webster]), especially Glaucomys volans and Glaucomys sabrinus, having parachute-like folds of skin extending from the fore to the hind legs, which enable them to make very long, gliding leaps.
nocturnal phalangers that move with gliding leaps using parachute-like folds of skin along the sides of the body
a rodent that glides, rather than flies, by means of a thin, furry skin, or membrane, that extends out from the