(adj) belonging to or active during the night, Ant.diurnal, Example: nocturnal animals are active at night; nocturnal plants have flowers that open at night and close by day
a. [ L. nocturnalis, nocturnus, fr. nox, noctis, night. See Night, and cf. Nocturn. ] 1. Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to diurnal. Dryden. [ 1913 Webster ]
2. Having a habit of seeking food or moving about at night; as, nocturnal birds and insects; raccoons are nocturnal.; -- of animals. [ 1913 Webster +PJC ]
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