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air jacket

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noun

an envelope of enclosed air around part of a machine, as for checking the transmission of heat.
British. life jacket.

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Origin of air jacket

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for air jacket

air jacket

noun

an air-filled envelope or compartment surrounding a machine or part to reduce the rate at which heat is transferred to or from itCompare water jacket
a less common name for life jacket
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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