air jacket

American  

noun

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

2. British. life jacket.

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air jacket British  

noun

1. an air-filled envelope or compartment surrounding a machine or part to reduce the rate at which heat is transferred to or from it Compare water jacket

2. a less common name for life jacket

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Etymology

Origin of air jacket

First recorded in 1905–10

Example Sentences

Laura Collett says she owes her life to a hi-tech air jacket after which left the British event rider with spine, shoulder and rib fractures.

From BBC

Air cooling is carried out by fans which drive air through air jackets on cylinders.

From Project Gutenberg

The lightweight air jacket, which is now used by many riders in eventing, is designed to inflate after a fall and offer a cushion to the neck, spine and body.

From BBC