Geometry. a plane curve generated by a point moving around a fixed point while constantly receding from or approaching it.
2.
a helix.
3.
a single circle or ring of a spiral or helical curve or object.
4.
a spiral or helical object, formation, or form.
5.
Aeronautics. a maneuver in which an airplane descends in a helix of small pitch and large radius, with the angle of attack within that of the normal flight range.
Football. a type of kick or pass in which the ball turns on its longer axis as it flies through the air.
7.
Economics. a continuous increase in costs, wages, prices, etc. (inflationary spiral), or a decrease in costs, wages, prices, etc. (deflationary spiral).
bound with a spiral binding; spiral-bound: a spiral notebook.
verb (used without object)
12.
to take a spiral form or course.
13.
to advance or increase steadily; rise: Costs have been spiraling all year.
14.
Aeronautics. to fly an airplane through a spiral course.
verb (used with object)
15.
to cause to take a spiral form or course.
Origin: 1545–55; < Medieval Latin spīrālis, equivalent to Latin spīr(a) coil (< Greek speîra anything coiled, wreathed, or twisted; see spire2) + -ālis-al1