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pilot lamp

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 of pilot lamp
First recorded in 1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for pilot lamp

pilot lamp

a small light in an electric circuit or device that lights up when the circuit is closed or when certain conditions prevail
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
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