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say it: dahy-UR-nuhl
diurnal is an adjective meaning "of or belonging to or active during the day". It carries 2 recorded senses.
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”
biology
Definitions, synonyms and semantic relations for diurnal come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.