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• water jacket
  water jacket

  noun

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

  verb (used with object)

  to surround or fit with a water jacket.

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

The loss through the water jacket of the average automobile power plant is over 50 per cent. of the total fuel efficiency.

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

The arrows show the inlet and outlet for the cooling water that is kept running through the water jacket round the nitrometer tube.

From Nitro-Explosives: A Practical Treatise by Sanford, P. Gerald (Percy Gerald)

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

The motor cylinder is surrounded by a water jacket in the usual manner, but it is unnecessary to water-jacket the displacer, as the gases are never hot.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various