dies, di-, die-, -diem, diurn-

(Latin: day)

Don't confuse this dies, "day" (DEE uhs) with the verb dies (DIGHZ) which refers to "dying" or "death".

tridiurnal (adjective) (not comparable)
1. Consisting of three days.
2. Occurring three times a day.

Another related "day" unit is located at hemer-.