/ Thesaurus / B Synonyms of biological clock Find synonyms for: Noun1. biological clock, mechanismusage: an innate mechanism in living organisms that controls the periodicity of many physiological functionsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language