from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An instrument displaying a line on a flight indicator that lies within the horizontal plane and about which the pitching and banking movements of an aircraft are shown. Also called gyro horizon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instrument that displays the pitch and roll of an aircraft in flight by comparing its attitude to a gyroscopically-maintained indication of the flat horizon line.
from the GNU version of the Collaborative International Dictionary of English
- adj. See under Horizon
- n. a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; -- used chiefly with the sextant for observing the double altitude of a celestial body.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot
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