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pilot lamp

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pilot lamp

–noun
an electric lamp, used in association with a control, which by means of position or color indicates the functioning of the control; an indicator light or a control light.
Also called pilot light.


Origin:
1880–85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pilot lamp  
n.  A small electric lamp used to indicate that an electric circuit is energized. Also called pilot light.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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