Hypertext Webster Gateway: "volution"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Volution \Vo*lu"tion\, n. [Cf. LL. volutio an arch, vault.]
1. A spiral turn or wreath.
2. (Zo["o]l.) A whorl of a spiral shell.
From WordNet (r) 1.7 (wn)
volution
n : a rolling or revolving motion
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