pilot light

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.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
pilot light
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Lint and dust may clog the air intakes for the burner, pilot light, and
  combustion chamber if they are allowed to build up.
Securely fasten the door that covers the pilot light and burner area.
When you replace an old appliance, arrange for the pilot light sensor to be
  recycled.
Instructions are supplied by the manufacturer and usually are located on the
  inside door cover near the pilot light.
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