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altimeter
Definição1
An instrument to indicate the height of an aircraft above a predetermined datum, normally sea level. Specifically, an instrument similar to an aneroid barometer that utilizes the change of atmospheric pressure with altitude to indicate the approximate elevation above a given point or plane used as a reference. A simple pressure altimeter is an airtight metal case, the interior of which is kept at atmospheric pressure by a tube connecting it to the static tube of the ASI (airspeed indicator). Inside the instrument case, a partially evacuated aneroid capsule is secured at the center of one of its faces to a base rigidly fixed to casing. A leaf spring prevents the collapse of the capsule. The capsule expands as aircraft gains height. The expansion of the capsule is converted into height through a system of gears. A pressure altimeter suffers from barometric, temperature, instrument, and lag errors. Radio or radar altimeters indicate heights above ground level.
Fonte1
KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
Definição2
An instrument that indicates flight altitude by sensing pressure changes and displaying altitude in feet or meters.
Fonte2
FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: . Acesso em: 10 fev. 2012.
Fonte3
BRASIL. Comando da Aeronáutica. Departamento de Controle do Espaço Aéreo. CNS/ATM Glossário. Disponível em: . Acesso em: 23 mar. 2012.
Português
altímetro
Imagem

 Schematic of a drum-type altimeter.

Schematic of a drum-type altimeter.

Fonte: http://en.wikipedia.org/wiki/File:Drum-Altimeter.png