ˈgrēb noun
( plural grebe or grebes )
Etymology: French grèbe
1. : any of various aquatic birds that constitute the family Colymibidae and order Colymbiformes, are closely related to the loons but with the toes lobate instead of webbed, have a rudimentary tail and narrow tarsi shaped like a blade, and are very expert divers and able to swim long distances under water — see great crested grebe , red-necked grebe
2. : a nearly neutral slightly reddish dark gray that is darker and slightly redder than lead