A barometer that measures atmospheric pressure without liquid, using a flexible metal box. Technical term; the cross-reference アネロイド気圧計 is a synonym.
See also: アネロイド気圧計
An aneroid barometer indicates changes in atmospheric pressure with a needle.
Compound of アネロイド (from English 'aneroid', ultimately from Greek a- 'without' + nēros 'wet') and 晴雨計 (seiu-kei, 'barometer', literally 'fair-rain meter').