biorhythms
/ˈbaɪoʊˌrɪðəmz/
noun
- The plural form of biorhythm; regular, repeating patterns of physical, emotional, or mental changes in a living thing.
- She read about biorhythms in a health magazine and decided to keep a journal.
- Many people track their biorhythms to predict good days for important tasks.
- The book explains how biorhythms might affect your energy and mood.