- of or relating to the night (opposed to diurnal).
- done, occurring, or coming at night: nocturnal visit.
- active at night (opposed to diurnal): nocturnal animals.
- opening by night and closing by day, as certain flowers (opposed to diurnal).
- an astrolabe for telling time at night or for determining latitude by the position of certain stars in reference to Polaris.
- of, used during, occurring in, or relating to the night
- (of animals) active at night
- (of plants) having flowers that open at night and close by day
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