a method of determining the concentration, activity, or effect of a change to substance by testing its effect on a living organism and comparing this with the activity of an agreed standard
verb (ˌbaɪəʊəˈseɪ)
2. (transitive)
to subject to a bioassay
bioassay in American English
(ˌbaɪoʊˈæseɪ)
US
noun
a technique for determining the power of a drug or other substance by measuring its effects on a test specimen against those of a standard substance