nocturnal
adjective
1. belonging to or active during the night
- nocturnal animals are active at night
- nocturnal plants have flowers that open at night and close by day
2. of or relating to or occurring in the night
- nocturnal darkness
Sentences with nocturnal as an adjective:
- nocturnal birds
- a suspicious nocturnal outing
noun
1. A person or creature that is active at night.
2. (historical) A device for telling the time at night, rather like a sundial but read according to the stars.