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Nocturnal signifies the group of animals that come out at night and sleep through the day (for example, an owl), as opposed to diurnal creatures who sleep at night and do their activities through the day.

If it is referring to a plant, it is one that blooms or opens at night.
nocturnal |näkˈtərnl| adjective done, occurring, or active at night : most owls are nocturnal. DERIVATIVES nocturnally |nɑkˈtərnli| adverb ORIGIN late 15th cent.: from late Latin nocturnalis, from Latin nocturnus ‘of the night,’ from nox, noct- ‘night.’

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9y ago

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