Circadian (adjective)

Relating to or occurring in approximately 24-hour cycles, especially as regulated by the body's internal clock.

Origin:

The word "circadian" comes from the latin words "circa" meaning around and "diem" meaning day. it was first recorded in english in the early 20th century.

Examples:

1. The scientist studied the circadian rhythm of fruit flies.
2. The jet lag disrupted his circadian rhythm.
3. The plant's circadian rhythm causes it to open its leaves during the day and close them at night.
4. The circadian rhythm of the human body is regulated by the release of melatonin.
5. The circadian rhythm of the animals was affected by the change in light exposure.