Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

also bio-rhythm, 1960, from bio- + rhythm. Related: Biorhythmic.

MORE RELATED WORDS FOR BIORHYTHM

biological clock

nouninternal clock
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.