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Meaning of water jacket

wa'ter jack"et

Pronunciation: [key]
  1. a water-filled casing or compartment used to water-cool something, as an engine or machine gun.

wa•ter-jack•et

Pronunciation: (wô'tur-jak"it, wot'ur-), [key]
— v.t.
  1. to surround or fit with a water jacket.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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