n. A spiral line, as of wire in a coil; a winding, or something that is spiral; a circumvolution; specifically, in geometry, the curve assumed by a right line drawn on a plane when that plane is wrapped round a cylindrical surface of any kind, especially a right cylinder, as the curve of a screw-thread; also, a curve on any developable surface which becomes a right “line when the surface is developed into a plane, as a conical helix.n. In architecture, any spiral, particularly a small volute or twist under the abacus of the Corinthian capital; also, a volute of the Ionic capital.n. In electricity, a coil of wire, as that surrounding the core of an electromagnet.n. In anatomy: The prominent curved fold which forms most of the rim or margin of the outer ear. See second cut under ear.n. The cochlea of the inner ear.n. [capitalized] [NL.] In conchology, the representative genus of Helicidæ and Helicinæ.