Biological Rhythms That Occur in Daily Cycles

This page is the CodyCross answer for the clue below from Australia, Group 1011, Puzzle 3 (Edith Cowan).

Question is: Biological Rhythms That Occur in Daily Cycles

and the answer is: CIRCADIAN

Word Meaning:

CIRCADIAN — (biology) Of, relating to, or showing rhythmic behaviour with a period of approximately 24 hours; especially of a biological process.

Definitions from Wiktionary.