Technology / Radar / Radar Altimeter: A radar altimeter is used by an aircraft to determine its height above terrain. MORE
Science / Weather / Pressure Altimeter: An aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used. MORE
Technology / Aviation / Altimeter Setting: A reference setting on the altimeter so that the instrument indicates an accurate altitude. MORE