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aneroid barometer

The definition of an aneroid-barometer is an instrument with a needle that moves when a change occurs in atmospheric pressure.

(noun)

An example of aneroid barometer is what a meteorologist would use to find out if rain is coming.

See aneroid barometer in Webster's New World College Dictionary

a barometer with a needle connected by mechanical linkages and springs to a thin, hollow metal disk in which a partial vacuum is maintained: a change in atmospheric pressure changes the shape of the disk, thus moving the needle

See aneroid barometer in American Heritage Dictionary 4

noun

A barometer in which variations of atmospheric pressure are indicated by the relative bulges of a thin elastic metal disk covering a partially evacuated chamber.

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