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.
- glow-plug, adjective
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British Dictionary definitions for glow 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: Also called: heater plug
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012