n. A rolling or winding; a twist; especially, a spiral turn; a convolution.n. In conchology: A whorl; one turn of a spiral shell.n. A set of whorls; the spire of a shell; the spiral turning or twisting of a shell. See cuts under spire, n., and univalve.n. In anatomy, a convolution or gyration; a gyrus: as, the volutions of the brain.