Definition of nightjar
: any of a family (Caprimulgidae) of medium-sized long-winged crepuscular or nocturnal birds (such as the whip-poor-wills and nighthawks) having a short bill, short legs, and soft mottled plumage and feeding on insects which they catch on the wing —called also goatsucker
Origin and Etymology of nightjar
from its harsh sound
First Known Use: 1630
Seen and Heard
What made you want to look up nightjar? Please tell us where you read or heard it (including the quote, if possible).