Origin: Latin suffix -al
Diurnal has 4 different meanings across 1 category:
A flower that opens only in the day.
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"
Happening or occurring during daylight, or primarily active during that time.
The word diurnal comes from the Latin term diurnālis, which is derived from diēs meaning "day." It is a doublet of the word journal.