aneroid
adjective
an·er·oid ˈa-nə-ˌrȯid 
: using no liquid
specifically : operating by the effect of outside air pressure on a diaphragm forming one wall of an evacuated container
aneroid barometer
Word History
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
First Known Use
circa 1842, in the meaning defined above
Medical Definition
aneroid
adjective
an·er·oid ˈan-ə-ˌrȯid
: containing no liquid or actuated without the use of liquid
an aneroid manometer