1. (Géométrie, Architecture) Ligne tracée en forme de vis autour d'un cylindre. Un escalier en hélice est composé de marches qui tournent avec une même inclinaison autour d'un pilier cylindrique.
2. Ensemble de pales servant ŕ propulser un navire, un avion, un hélicoptère.
ETYM Latin helix, Greek, to turn round; cf. Latin volvere, and Eng. volute, voluble.
Screw-shaped coil.
A curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle; SYN. spiral.
Any spiral-formed object; rim of outer ear; snail-shell; screw-thread.
In mathematics, a three-dimensional curve resembling a spring, corkscrew, or screw thread. It is generated by a line that encircles a cylinder or cone at a constant angle.
A device that rotates to push against air or water; SYN. propellor.