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say it: nahk-TUR-nuhl
nocturnal is an adjective meaning "belonging to or active during the night". It carries 2 recorded senses.
belonging to or active during the night
“nocturnal animals are active at night”
“nocturnal plants have flowers that open at night and close by day”
biology
of or relating to or occurring in the night
“nocturnal darkness”
Definitions, synonyms and semantic relations for nocturnal 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.