Biorhythm

Origin

First coined 1960, from - + rhythm

Full definition of biorhythm

Noun

1. (biology) Any cyclic biological or physiological pattern or activity
2. (pseudoscience) Any of three sinusoidal graphs, normally plotted by computer, having a person's birthdate as origin, that that are supposed to give meaningful information about emotional levels, physical energy levels, and mental/psychic sensitivity.