glow plug

noun Automotive, Machinery.
a device for each cylinder of a diesel engine with a heating element to heat the incoming fuel and air so that combustion will take place more readily when the engine is cold.

Origin:
1940–45

glow-plug, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glow plug
 
n
Also called: heater plug one of usually four plugs fitted to the cylinder block of a diesel engine that warms the engine chamber to facilitate starting in cold weather

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The influence of the position of the glow plug and of the piston shape were
  investigated.
Replaces glow plug components such as glow plug control, sensors, and glow
  plugs.
The glow plug was located as close to the injector as the head casting would
  allow.
Reliable diesel engine offers glow plug preheat system for long service life
  and easier cold weather starting.
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