indicator: Meaning and Definition of


Pronunciation: (in'di-kā"tur), [key]
— n.
  1. a person or thing that indicates.
  2. a pointing or directing device, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, or the like.
  3. an instrument that indicates the condition of a machine or the like.
  4. an instrument for measuring and recording variations of pressure in the cylinder of an engine.
    1. a substance, as litmus, that indicates the presence or concentration of a certain constituent.
    2. a substance often used in a titration to indicate the point at which the reaction is complete.
  5. a plant or animal that indicates, by its presence in a given area, the existence of certain environmental conditions.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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