资料来源 : pyDict

涡形,旋涡,螺旋

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

资料来源 : WordNet®

volution
     n : a rolling or revolving motion