volution

A turn or twist about a center; a spiral.

One of the whorls of a spiral gastropod shell.

A rolling or winding; a twist; especially, a spiral turn; a convolution.

In conchology: A whorl; one turn of a spiral shell.

A set of whorls; the spire of a shell; the spiral turning or twisting of a shell. See cuts under spire, n., and univalve.

In anatomy, a convolution or gyration; a gyrus: as, the volutions of the brain.

A spiral turn or wreath.

A whorl of a spiral shell.

A turning (rolling or revolving) motion

A single turn of a coil