電でん波ぱ高こう度ど計けい

noun

radio altimeter

An instrument that measures altitude above the terrain using radio waves, used in aircraft and spacecraft.

• 電でん波ぱ高こう度ど計けいは航こう空くう機きの安あん全ぜんな着ちゃく陸りくに不ふ可か欠けつだ。

  A radio altimeter is essential for the safe landing of aircraft.