precombustion chamber
noun
: an auxiliary space in which combustible gases are ignited and combustion started ahead of the main combustion chamber of a jet or gas engine
The glow plug is an electrically operated device that protrudes into the precombustion chamber. When energized the glow plug tip heats to a dull red. The swirling, highly compressed air-fuel mixture is heated by the glow plug tip.—
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“Precombustion chamber.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/precombustion%20chamber. Accessed 3 Nov. 2025.
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