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altimeter

noun

  1. instrument used to measure the altitude of an object above a fixed level
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Wiktionary

Pronunciation: /ælˈtɪm.ɪ.tɚ/

noun

Etymology: Coined based on Latin altus (“high”) + -meter.

  1. An apparatus for measuring altitude.

    For that reason, if you do any mountain climbing, allow a generous margin of error of extra altitude—not only for possible altimeter error, but also for downdrafts that are particularly prevalent if high winds are encountered.