Definition of aneroid noun from the Oxford Advanced Learner's Dictionary

 

aneroid

 noun
noun
BrE BrE//ˈænərɔɪd//
 
; NAmE NAmE//ˈænərɔɪd//
 
 
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a type of barometer that measures air pressure by the action of air on the elastic lid of a box containing a vacuum Word Origin mid 19th cent.: coined in French from Greek a- ‘without’ + nēros ‘water’.

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