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.
Cite This Source Link To water jacket
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
During periods of low airflow, creosote collects on the water jacket walls.
The equipment for testing compressed gas type cylinders shall be of the water
  jacket type.
Although the water jacket is a welded system, openings are designed to add and
  remove water from the water jacket.
Power for battery charger and water jacket heater from an outside source.
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