Plural of altimeter; instruments that measure altitude or height above a reference point, used in aircraft, mountaineering, and weather observation.
From Latin altus (high) and Greek -metron (measure), creating 'height measurer.' Multiple altimeters can read different altitudes simultaneously in different locations.
Altimeters revolutionized aviation by giving pilots precise altitude data; early pilots flew by feel and landmark recognition, but altimeters transformed flying from dangerous guesswork into navigable science.
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