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The Collaborative International Dictionary of English v.0.48 (gcide)

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.
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The gyrations of an ascending balloon. --De Quincey.
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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.
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2. (Zool.) One of the whorls of a spiral univalve shell.
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{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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