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diurnal - of or belonging to or active during the day; diurnal animals are active during the day; diurnal flowers are open during the day and closed at night; diurnal and nocturnal offices. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
Antonym to nocturnal is diurnal, which means primarily active during the day. Therefore the animals that come out in daylight are called diurnal animals. It is old word c.1390, from L.L. diurnalis = day.