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Gyra"tion
(jr"shn), n.
1. The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution.
The gyrations of an ascending balloon.
De Quincey.
If a burning coal be nimbly moved round in a circle, with gyrations continually repeated, the whole circle will appear like fire.
Sir I. Newton.
2. (Zol.) One of the whorls of a spiral univalve shell. Center of gyration. (Mech.) See under Center. -- Radius of gyration, the distance between the axis of a rotating body and its center of gyration. Rankine.
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