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indicator

[ in-di-key-ter ]
/ ˈɪn dɪˌkeɪ tər /
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See synonyms for: indicator / indicators on Thesaurus.com

noun
a person or thing that indicates, signals, or points out.
a pointing or directing mechanism, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, etc., or a moveable icon in the graphical user interface of a computer or other device: The fuel indicator was pointing to empty.Move the indicator to the edge of the browser and drag to resize the window.
an instrument that indicates the condition of a machine or the like.
an instrument for measuring and recording variations of pressure in the cylinder of an engine.
Chemistry.
  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.
Ecology. a plant, animal, or species that indicates, by its presence in a given area, the existence of certain environmental conditions.
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Origin of indicator

First recorded in 1660–70; from Late Latin indicātor, equivalent to Latin indicā(re) “to make known, point out” + -tor; see origin at indicate, -tor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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British Dictionary definitions for indicator

indicator
/ (ˈɪndɪˌkeɪtə) /

noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for indicator

indicator
[ ĭndĭ-kā′tər ]

A chemical compound that changes color and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is an indicator that becomes red in the presence of acids and blue in the presence of bases.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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