diurnal adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of diurnal adjective from the Oxford Advanced American Dictionary

diurnal

adjective

NAmE//daɪˈərnl//

1(biology) (of animals) active during the day Unlike most other bats, this species is diurnal. opposite nocturnal

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2(astronomy) taking one day the diurnal rotation of the earth

See diurnal in the Oxford Advanced Learner's Dictionary

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