Meaning of glow plug

glow' plug"

Pronunciation: [key]
— Auto., Mach. Auto.,Mach.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.