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

wa·ter-jack·et

[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. 2013.
Cite This Source Link To water jacket
00:10
Water jacket is always a great word to know.
So is doohickey. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a gadget; dingus; thingumbob.
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
Heat was supplied by a recirculating water bath that provided flow through the
  water jacket surrounding the purge and trap vessel.
Power for battery charger and water jacket heater from an outside source.
During periods of low airflow, creosote collects on the water jacket walls.
The reactor temperature was controlled by means of a water jacket.
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