Gyrocompass definition

jīrō-kŭmpəs, -kŏm-
A compass with a motorized gyroscope whose angular momentum interacts with the force produced by the earth's rotation to maintain a north-south orientation of the gyroscopic spin axis, thereby providing a stable directional reference.
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A compass consisting of a motor-operated gyroscope whose rotating axis, kept in a horizontal plane, takes a position parallel to the axis of the earth's rotation and thus points to the geographical north pole instead of to the magnetic pole.
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Alternative Forms

Alternative Form of gyrocompass - gyro compass