water jacket

¹ American  

noun

1. a water-filled casing or compartment used to water-cool something, as an engine or machine gun.

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water-jacket ² American  

[waw-ter-jak-it, wot-er-] / ˈwɔ tərˌdʒæk ɪt, ˈwɒt ər- /

verb (used with object)

1. to surround or fit with a water jacket.

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water jacket British  

noun

1. a water-filled envelope or container surrounding a machine, engine, or part for cooling purposes, esp the casing around the cylinder block of a pump or internal-combustion engine Compare air jacket

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Etymology

Origin of water jacket¹

First recorded in 1865–70

Origin of water-jacket²

First recorded in 1875–80

Example Sentences

It has a feeder which pushes coal in at one end and ashes out at the other, a water jacket, a small pump which circulates the heated water rapidly to radiators.

From Time Magazine Archive

As the water becomes cooler, it falls to the bottom of the radiator and it is again supplied to the water jacket.

From Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred

The Nuts are kept warm by a water jacket which surrounds the Pan, and is heated by a Gas or Oil Stove as desired, has steam whistle which attracts attention.

From The Candy Maker's Guide A Collection of Choice Recipes for Sugar Boiling by Fletcher Manufacturing Company

The gas is lighted and the water jacket maintained at a high temperature until filtration is completed.

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by Eyre, J. W. H. (John William Henry)

Special attention has been given to the design of the water jacket around the valves and head, there being two inches of water space above same.

From Aviation Engines Design?Construction?Operation and Repair by Pag?, Victor Wilfred