Medical Dictionary
indicator
noun in·di·ca·tor \ˈin-də-ˌkāt-ər\
Medical Definition of INDICATOR
: a substance (as a dye) used to show visually usually by its capacity for color change the condition of a solution with respect to the presence of free acid or alkali or some other substance (as in detecting the end point of a titration) <litmus and phenolphthalein are acid-base indicators>
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