The Collaborative International Dictionary of English v.0.48:

Aneroid \An"e*roid\, a. [Gr. 'a priv. + nhro`s wet, moist +
   -oid: cf. F. an['e]ro["i]de.]
   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]

The Collaborative International Dictionary of English v.0.48:

aneroid \an"e*roid\, n.
   An aneroid barometer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aneroid
    adj 1: containing no liquid or actuated without the use of
           liquid; "aneroid barometer"
    n 1: a barometer that measures pressure without using fluids
         [syn: aneroid barometer, aneroid]