An″e‐roid (�), a. [Gr. ἀ priv. + νηρόσ wet, moist + -oid: cf. F. anéroïde.] Containing no liquid; — said of a kind of barometer.
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.