Gy‐ra″tion (jī̍‐rā″shŭn), 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. (Zoöl.) 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.