pilot-light

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
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