water jacket

English

Noun

water jacket (plural water jackets)

1. An enclosed space, or the walls used to create it, that surrounds an object to be heated or cooled by water flowing around it.
   • 1949, American Railway Engineering Association, Bulletin - Issues 481-487, page 277:

     The headbolt heater consists of a hollow steel bolt containing an electric heating element. This device is designed to heat the water jacket and is applied to the engine head by replacing a headbolt.

Translations

enclosed space

• Finnish: vesivaippa