ClipArt ETC
"A valve in pumps with a single flap, hinged at one edge, and consisting of a plate of leather a little larger than the valve aperture. The valve box is generally one and a half times the diameter of the valve opening." — Williams, 1889

Clack-valve

"A valve in pumps with a single flap, hinged at one edge, and consisting of a plate of leather a little…

Used in combination with the vehicle fender to protect vehicle passengers, other vehicles, and pedestrians from mud and other flying debris thrown into the air by the rotating tire.

Mud Guard

Used in combination with the vehicle fender to protect vehicle passengers, other vehicles, and pedestrians…

A gliding mammal that uses the flaps of extra skin between their legs to glide from higher to lower locations.

Flying Lemur

A gliding mammal that uses the flaps of extra skin between their legs to glide from higher to lower…