helix

Short definition from Wiktionary

Noun

1. 1
   A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
2. 2
   A small volute under the abacus of a Corinthian capital.
3. 3
   The incurved rim of the external ear.
4. 4
   An upside down midair 360° spin in playboating.

Verb

1. 1
   To form or cause to form a helix.