Definition from Wiktionary, the free dictionary
- (mathematics) 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.
- (architecture) A small volute under the abacus of a Corinthian capital.
- (anatomy) The incurved rim of the external ear.
- An upside down midair 360° spin in playboating.
- (curve): spiral (not in technical use)