1 a spiral curve (like a corkscrew) or a coiled curve (like a watch spring).
2 Geom. a curve that cuts a line on a solid cone or cylinder, at a constant angle with the axis.
3 Archit. a spiral ornament.
4 Anat. the rim of the external ear.
Etymology: L helix -icis f. Gk helix -ikos
Useful english dictionary. 2012.