Breadcrumb Home > Dictionary > Index G glow plug: Meaning and Definition of Find definitions for: glow' plug" Pronunciation: [key] — Auto., Mach. Auto.,Mach. 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. glow lamp glowworm TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: fatuous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language