altimeter

[al-tim-i-ter, al-tuh-mee-ter]
noun
1.
a sensitive aneroid barometer that is graduated and calibrated, used chiefly in aircraft for finding distance above sea level, terrain, or some other reference point by a comparison of air pressures.
2.
any device used for the same purpose that operates by some other means, as by radio waves.

Origin:
1820–30; alti- + -meter

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Collins
World English Dictionary
altimeter (ælˈtɪmɪtə, ˈæltɪˌmiːtə)
 
n
an instrument that indicates height above sea level, esp one based on an aneroid barometer and fitted to an aircraft

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

altimeter
1918, from Mod.L. altimeter, from alti- "high" (from L. altus) + meter (from Gk. metron "measure;" see meter).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
altimeter   (āl-tĭm'ĭ-tər)  Pronunciation Key 
An instrument that measures and indicates the height above sea level at which an object, such as an airplane, is located.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The autopilot was working, however, but the problem was in a radio altimeter.
Another kind of barometric reading is the altimeter setting, which aircraft use.
Text explains differences between station pressure, sea level pressure and altimeter setting.
One of the calculations you can perform on it is correcting station pressure for the altimeter setting.
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