adj of or pertaining to a spiral; like a spiral.
2. spiral ·adj anything which has a spiral form, as a spiral shell.
3. spiral ·adj winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
4. spiral ·adj winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
5. spiral ·adj 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.