·adj Of or pertaining to a spiral; like a spiral.
II. Spiral ·adj Anything which has a spiral form, as a spiral shell.
III. Spiral ·adj Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
IV. 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.
V. 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.