/ Dictionary / Index B bioactivity: Meaning and Definition of Find definitions for: bi•o•ac•tiv•i•ty Pronunciation: (bī"ō-ak-tiv'i-tē), [key] — n. any effect on, interaction with, or response from living tissue. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bioacoustics bioassay Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language