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Definition of Nocturnal
1. Adjective. Belonging to or active during the night. "Nocturnal plants have flowers that open at night and close by day"
2. Adjective. Of or relating to or occurring in the night. "Nocturnal darkness"
Partainyms: Night
Definition of Nocturnal
1. a. Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to diurnal.
2. n. An instrument formerly used for taking the altitude of the stars, etc., at sea.
Definition of Nocturnal
1. [adj]
Medical Definition of Nocturnal
1. Pertaining to, occurring at or active at night. Origin: L. Nocturnus This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)