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glow plug

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WordReference Random House Unabridged Dictionary of American English © 2026

glow′ plug′, [Auto., Mach.]

Automotive, Mechanical Engineeringa 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.

1940–45

glow′-plug′, adj.

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