air gauge

noun

variants or less commonly air gage

1

: a gauge for measuring air pressure

2

: a comparator in which the rate of escape of air between the surface under test (as that of a gun bore) and one of known curvature nearly fitting it (as that of a spindle inserted in the bore) is used as a measure of the difference between the two

Word History

First Known Use

1781, in the meaning defined at sense 1

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