n. an American bird (Chordeiles Virginianus), allied to the goatsucker. It hunts the insects on which it feeds toward evening, on the wing, and often, diving down perpendicularly, produces a loud whirring sound, like that of a spinning wheel.n. A person who likes to be active late at night; a night owl.n. Any of several mainly nocturnal North American goatsuckers, especially Chordeiles minor, or the related European goatsucker Caprimulgus europaeus, also called the nightjar.