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

 

altimeter

 noun
noun
BrE BrE//ˈæltɪmiːtə(r)//
 
; NAmE NAmE//ælˈtɪmətər//
 
Parts of a plane
 
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an instrument for showing height above sea level, used especially in an aircraft See related entries: Parts of a plane Word Origin early 20th cent.: from Latin altus ‘high’ + -meter (see meter).
See the Oxford Advanced American Dictionary entry: altimeter