air jacket

air jacket

noun
1.
an envelope of enclosed air around part of a machine, as for checking the transmission of heat.
2.
British, life jacket.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
air jacket
 
n
1.  Compare water jacket an air-filled envelope or compartment surrounding a machine or part to reduce the rate at which heat is transferred to or from it
2.  a less common name for life jacket

Collins English Dictionary - Complete & Unabridged 10th Edition
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