/ Dictionary / Index B biological rhythm: Meaning and Definition of Find definitions for: biolog'ical rhythm' Pronunciation: [key] — Physiol. Physiol. biorhythm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biological psychiatry biological value Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language