Nighthawk definitions

nīt'hôk'
Any of several nightjars found throughout the Americas, having grayish-brown plumage that mimics leaves on the forest floor, especially Chordeiles minor.
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Any of various nightjars that feed on flying insects, esp., the common nighthawk (Chordeiles minor), which is active during the day or night.
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A night owl.
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noun
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(UK, regional) A nightjar, especially Caprimulgus europaeus. [from 17th c.]
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(US) A New World nightjar of the genus Chordeiles, especially Chordeiles minor. [from 18th c.]
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A person whose preference or custom is to remain awake and active during the night and the early morning hours. [from 19th c.]
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Origin of nighthawk

From night +"Ž hawk.