Definitions
1.NounA nightjar, especially Caprimulgus europaeus (Eurasian nightjar). .mw-parser-output .defdate{font-size:smaller}
2.NounA New World nightjar of the genus Chordeiles, especially Chordeiles minor.
3.NounA person whose preference or custom is to remain awake and active during the night and the early morning hours.
4.NounA nighthawker (metal detectorist who works illegally at night).
5.NounAn unlicensed prostitute who worked the roadsides at night.