diurnal

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di·ur·nal / dīˈərnl/ • adj. 1. of or during the day. ∎  Zool. (of animals) active in the daytime. ∎  Bot. (of flowers) open only during the day.2. daily; of each day: diurnal rhythms. ∎  Astron. of or resulting from the daily rotation of the earth.DERIVATIVES: di·ur·nal·ly adv.

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