A Bioassay is a test to determine te relative strength of a substance by comparing its effect on a test Organism with that of a standard preparation.
Other /More definition:
A bioassay is a laboratory or field test in which living organisms are used to detect the presence of or test the effect of a particular substance, factor, or condition. Results are compared to a standard preparation or control to determine the relative strength of the substance, factor, or condition.

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