altimeter
noun
- instrument used to measure the altitude of an object above a fixed level
Wiktionary
Pronunciation: /ælˈtɪm.ɪ.tɚ/
noun
Etymology: Coined based on Latin altus (“high”) + -meter.
- 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.”