Definition of prechamber in English:

prechamber

noun

  • In some diesel engines: a small chamber near the cylinder head in which a portion of fuel-air mixture can be compressed and heated to facilitate or initiate combustion.

Origin

1930s. Short for pre-combustion chamber from pre-combustion + chamber.

Pronunciation

prechamber

/ˈpriːˌtʃeɪmbə/