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.

air jacket

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

Word History and Origins

Origin of air jacket¹

First recorded in 1905–10

Example Sentences

A is the calorimetric tube, B the air-jacket and L the gauge.

From Project Gutenberg