terrain-clearance indicator


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terrain-clearance indicator:

see altimeteraltimeter
, device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear elevation as an airplane, balloon, or mountain climber rises.
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terrain-clearance indicator

[tə′rān ¦klir·əns ‚in·də‚kād·ər]
(engineering)