air casing

noun

Definition of air casing 

1 : a casing (as of sheet iron) surrounding a pipe or reservoir with an air space between to prevent transmission of heat

2 : the coaming around the stack of a ship at the weather deck serving to ventilate the boiler room

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First Known Use of air casing

1839, in the meaning defined at sense 1

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The first known use of air casing was in 1839

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