Aneroid
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Webster's Dictionary [1]
(1): (a.) Containing no liquid; - said of a kind of barometer.
(2): (n.) An aneroid barometer.
The Nuttall Encyclopedia [2]
A barometer, consisting of a small watch-shaped, air-tight, air-exhausted metallic box, with internal spring-work and an index, affected by the pressure of the air on plates exposed to its action.