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Altimeter

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Merriam-Webster's Collegiate Dictionaryal·tim·e·ter  \al-ˈti-mə-tər, ˈal-tə-ˌmē-tər\ noun ETYMOLOGY  Latin altus + English -meter
 DATE  circa 1828
: an instrument for measuring altitude; especially : an aneroid barometer designed to register changes in atmospheric pressure accompanying changes in altitude• al·tim·e·try  \al-ˈti-mə-trē\ noun
English Etymologyaltimeter  1918, from Mod.L. altimeter, from alti- "high" (from L. altus) + meter (from Gk. metron "measure;" see meter).
Oxford Advanced Learner's Dictionary-牛津双解-OALD7altimeteral·tim·eter / 5Altimi:tE(r); NAmE Al5timEtEr / noun   an instrument for showing height above sea level, used especially in an aircraft   (尤指用于飞行器中的)测高计,高度表
Webster's Third New International Dictionary, Unabridgedal·tim·e·ter\alˈtim ə]d.ə(r), ˈalt əˌmē]d.ə(r), ]t ə-\ noun(-s)Etymology: alti- + -meter: an instrument for measuring height (as above sea level or ground level) usually in the form of an aneroid barometer designed to register changes in atmospheric pressure accompanying changes in altitude and calibrated in feet, yards, or meters

Altimeter Noun An Instrument Al·Tim·E·Ter Altus Meter Measuring