any effect on, interaction with, or response from living tissue.
Origin of bioactivity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
The effect of a given agent, such as a vaccine, upon a living organism or on living tissue.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.