noun

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. A small volute under the abacus of a Corinthian capital.

3. The incurved rim of the external ear.

Synonyms: spiral

verb

1. To form or cause to form a helix.