aneroid

a. [ Gr. 'a priv. + nhro`s wet, moist + -oid: cf. F. anéroïde. ] Containing no liquid; -- said of a kind of barometer. [ 1913 Webster ]

Aneroid barometer, a barometer the action of which depends on the varying pressure of the atmosphere upon the elastic top of a metallic box (shaped like a watch) from which the air has been exhausted. An index shows the variation of pressure. [ 1913 Webster ]