gyrational

gyration

[jahy-rey-shuhn]
noun
the act of gyrating; circular or spiral motion; revolution; rotation; whirling.

Origin:
1605–15; < Late Latin gȳrātiōn- (stem of gȳrātiō). See gyrate, -ion

gyrational, adjective
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World English Dictionary
gyration (dʒaɪˈreɪʃən)
 
n
1.  the act or process of gyrating; rotation
2.  any one of the whorls of a spiral-shaped shell

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Word Origin & History

gyration
1615, from L.L. gyratum, pp. of gyrare, from L. gyrus "circle" (see gyre). Gyrate (v.) is an 1822 back-formation (implied in gyrated).
Online Etymology Dictionary, © 2010 Douglas Harper
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