an instrument that indicates height above sea level, esp one based on an aneroid barometer and fitted to an aircraft
WordReference Random House Learner's Dictionary of American English © 2026
al•tim•e•ter /ælˈtɪmɪtɚ, ˈæltəˌmitɚ/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Aeronauticsa device used in aircraft to determine altitude during flight. See -alti-.
al•tim•e•ter
(al tim′i tər, al′tə mē′tər),USA pronunciation n.
- Aeronauticsa 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.
- any device used for the same purpose that operates by some other means, as by radio waves.
- alti- + -meter 1820–30
Collins Concise English Dictionary © HarperCollins Publishers::
'altimeter' also found in these entries (note: many are not synonyms or translations):