Aneroid

an;er;oid pronunciation: function: adjective etymology: french anéro?de, from greek a- + late greek nēron water, from greek, neuter of nearos, nēros fresh; akin to greek neos new — more at newdate: circa 1848 : using no liquid; specifically : operating by the effect of outside air pressure on a diaphragm forming one wall of an evacuated container lt;aneroid barometergt;