altimeter

Noun
  1. An instrument that measures the height above ground;
    Used in navigation (synset 102703117)
    is a type of: measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
    subtypes: hypsometer - an altimeter that uses the boiling point of water to determine land elevation
    has: aneroid, aneroid barometer - a barometer that measures pressure without using fluids

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