- (a.) Of or pertaining to a spiral; like a spiral.
- (a.) Anything which has a spiral form, as a spiral shell.
- (a.) A plane curve, not reentrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. Helix.
- (a.) Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
- (a.) Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). spiral. Retrieved September 20, 2026, from http://smartdefine.org/spiral/definitions/2064981 |
| Chicago | Webster's. 2011. "spiral" http://smartdefine.org/spiral/definitions/2064981 (accessed September 20, 2026). |
| Harvard | Webster's 2011, spiral, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/spiral/definitions/2064981>. |
| MLA | Webster's. "spiral" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/spiral/definitions/2064981> |