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  1. A device which utilizes the angular momentum of a spinning mass (rotor) to sense angular motion of its base about one or two axes orthogonal to the spin axis. Also called gyroscope.
    This definition does not include more complex systems such as stable platforms using gyros as components.
  2. Short for directional gyro, gyrocompass , etc.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use