water-jacket

water jacket

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

Origin:
1865–70

Dictionary.com Unabridged

water-jacket

[waw-ter-jak-it, wot-er-]
verb (used with object)
to surround or fit with a water jacket.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
water jacket
 
n
Compare air jacket 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

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