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English to English adjective
| 1 |
belonging to or active during the night |  | Example: nocturnal animals are active at night
nocturnal plants have flowers that open at night and close by day
source: wordnet30
| 2 |
of or relating to or occurring in the night | | Example: nocturnal darkness
source: wordnet30
| 3 |
Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to diurnal. | | source: webster1913
noun
| 4 |
An instrument formerly used for taking the altitude of the stars, etc., at sea. | | source: webster1913
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