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. 2013.
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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
Cite This Source
00:10
Pilot light is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a gadget; dingus; thingumbob.
Example sentences
Securely fasten the door that covers the pilot light and burner area.
Lint and dust may clog the air intakes for the burner, pilot light, and
  combustion chamber if they are allowed to build up.
The heater's pilot light appears to have ignited cardboard and cloth materials.
Pilot light sensors found in gas appliances such as stoves, furnaces, and water
  heaters.
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