bioassay
Meaning
The determination of the strength or biological activity of a substance (such as a vitamin or hormone) by measuring its effect on a living organism or tissue compared to a standard preparation.
To subject to or perform a bioassay.
Structure
Usage
The laboratory conducted a bioassay to measure the toxicity of the new chemical in zebrafish.
Before clinical trials, the drug's potency must be verified by bioassay.
Researchers developed a rapid plant-based bioassay for detecting environmental pollutants.
Etymology
The term 'bioassay' is a modern scientific compound, formed in the early 20th century by combining two classical elements. The first, 'bio-', draws directly from the Greek word for 'life', establishing the subject of the test. The second, 'assay', has a rich history tracing from Latin 'exagium' (the act of weighing) through Old French, entering English with the specific sense of analyzing substances like metals or drugs. The logical fusion creates a precise term meaning "a test using life," where a living system—such as an animal, plant, or tissue—becomes the measuring instrument to evaluate the potency or effect of another substance, translating ancient roots into a key methodology of pharmacology and biology.
Analysis
- bio: From Greek 'bios' (life). A combining form meaning 'life' or 'living organisms'. - assay: From Old French 'assai', 'essai' (trial), ultimately from Latin 'exagium' (a weighing). A noun and verb meaning a test or analysis, especially of an ore or drug.