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diurnal - 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. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
Passionate about all things Australian. 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.oalas are nocturnal means that koalas are active at night, and  sleep during the day. The opposite of nocturnal is diurnal, meaning  active during the day. 2 people found this useful. Edit.