Definitions for water jacket
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Random House Webster's College Dictionary
wa′ter jack`et(n.)
a water-filled casing or compartment used to water-cool something, as an engine or machine gun.
Category: Machinery
Origin of water jacket:
1865–70
Princeton's WordNet
water jacket(noun)
a container filled with water that surrounds a machine to cool it; especially that surrounding the cylinder block of an engine
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"water jacket." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/water jacket>.