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WordReference Random House Unabridged Dictionary of American English © 2024an′eroid barom′eter, - Meteorologya device for measuring atmospheric pressure, often specially calibrated for use as an altimeter, consisting of a box or chamber partially exhausted of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air. Cf. mercury barometer.
Collins Concise English Dictionary © HarperCollins Publishers:: aneroid barometer n - a device for measuring atmospheric pressure without the use of fluids. It consists of a partially evacuated metal chamber, the thin corrugated lid of which is displaced by variations in the external air pressure. This displacement is magnified by levers and made to operate a pointer
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