nocturnal


nocturnal
Pertaining to the hours of darkness; opposite of diurnal (1). [L. nocturnus, of the night]

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noc·tur·nal näk-'tərn-əl adj
1) of, relating to, or occurring at night <\nocturnal myoclonus>
2) characterized by nocturnal activity <a \nocturnal form of filariasis>

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noc·tur·nal (nok-turґnəl) [L. nocturnus] pertaining to, occurring at, or active at night.

Medical dictionary. 2011.

Synonyms: