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  Dictionary Definition of altimeters

altimeter
noun
1. a sensitive aneroid barometer calibrated and graduated to measure altitudes by the decrease of atmospheric pressure with height, used in aircraft for finding distance above sea level, terrain, or some other reference point.
2. any device used for the same purpose which operates by some other means, as by radio waves, etc.
[ ALTI-+METER1 ]
-- altimetry , noun