/ Thesaurus / B Synonyms of bio assay Find synonyms for: Noun1. bioassay, bio-assay, assayusage: appraisal of the biological activity of a substance by testing its effect on an organism and comparing the result with some agreed standardVerb1. bioassay, assayusage: subject to a bio-assayWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language