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pilot light

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noun
  1. Also called pilot, pilot burner. a small flame kept burning continuously, as in a gas stove or furnace, to relight the main gas burners whenever necessary or desired.
  2. pilot lamp.
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Origin of pilot light

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pilot light

pilot light

noun
  1. a small auxiliary flame that ignites the main burner of a gas appliance when the control valve opens
  2. a small electric light used as an indicator
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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