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gyroscope
noun
a wheel mounted in a set of rings so that its axis of rotation is free to turn in any direction: when the wheel is spun rapidly, it will keep the original direction of its rotation axis no matter which way the ring is turned: gyroscopes are used in gyrocompasses and to keep moving ships, airplanes, etc. level
Related Forms:
- gyroscopic adjective
- gyroscopically adverb
See gyroscope in American Heritage Dictionary 4
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