日にっ周しゅう

noun, used as a prefix

diurnal; daily cycle

Technical prefix used in scientific or astronomical contexts to describe phenomena related to a 24-hour day, such as 日周運動 (diurnal motion).

• 日にっ周しゅう運うん動どうは地ち球きゅうの自じ転てんによって起おこる。

  Diurnal motion is caused by the Earth's rotation.

• この生せい物ぶつの日にっ周しゅうリズムは光ひかりに影えい響きょうされる。

  The diurnal rhythm of this organism is influenced by light.