Meaning of INDICATOR in English

INDICATOR

( n. )

That which indicates the condition of acidity, alkalinity, or the deficiency, excess, or sufficiency of a standard reagent, by causing an appearance, disappearance, or change of color, as in titration or volumetric analysis.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.