Pronunciation: in'di-ka'tor, -tor
- In chemical analysis, a substance that changes color within a certain definite range of pH or oxidation potential, or in any way renders visible the completion of a chemical reaction, litmus, phenolsulfonphthalein.
- An isotope that is used as a tracer.
- The labeled substance the distribution of which between reactants of a system is used to determine the amount of analyte present.
[L. one that points out]
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Examples: glitazone, GI cocktail, etc.