Main Entry: an·er·oid

Pronunciation: \ˈa-nə-ˌrȯid\

Function: adjective

Etymology: French anéroïde, from Greek a- + Late Greek nēron water, from Greek, neuter of nearos, nēros fresh; akin to Greek neos new — more at new

Date: circa 1848

: using no liquid; specifically : operating by the effect of outside air pressure on a diaphragm forming one wall of an evacuated container <aneroid barometer>