any effect on, interaction with, or response from living tissue.

1970–75; bio- + activity

bioactive, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bioactive (ˌbaɪəʊˈæktɪv)
(of a substance) having or producing an effect on living tissue

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

bioactivity bi·o·ac·tiv·i·ty (bī'ō-āk-tĭv'ĭ-tē)
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
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Example sentences
Algae certainly can do some interesting biochemistry, and no doubt there is bioactivity there to be tapped.
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