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radius of gyration
From The Collaborative International Dictionary of English v.0.48:
Gyration \Gy*ra"tion\ (j[-i]*r[=a]"sh[u^]n), n. 1. The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution. [1913 Webster] The gyrations of an ascending balloon. --De Quincey. [1913 Webster] 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. [1913 Webster] 2. (Zool.) One of the whorls of a spiral univalve shell. [1913 Webster] 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. [1913 Webster]