Word forms: (regular plural) glow plugs
(Automotive engineering: Vehicle components, Engine, transmission, and exhaust) A glow plug is an electrically heated plug that is fitted to the cylinder head of a diesel engine
to make it easier to start the engine in cold conditions. ▶ plug1, plug2
⇒ The miniature motor doesn't need an ignition system, just a glow plug to get it started. ⇒ The glow plug circuit is used on the diesel engine to initially start the engine. ⇒ Each cylinder has a small glow plug that begins heating the air in the pre-combustion chamber.
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