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spirals

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Spiral \Spi"ral\, noun [Cf. F. spirale. See {Spiral}, adjective]

1. (Geom.) 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}.

2. Anything which has a spiral form, as a spiral shell.

{Spiral of Archimedes}, a spiral the law of which is that the generatrix moves uniformly along the revolving line, which also moves uniformly.

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Spiral \Spi"ral\, adjective [Cf. F. spiral. See {Spire} a winding line.]

1. Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.

2. Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.

3. (Geom.) Of or pertaining to a spiral; like a spiral.

{Spiral gear}, or {Spiral wheel} (Mach.), a gear resembling in general a spur gear, but having its teeth cut at an angle with its axis, or so that they form small portions of screws or spirals.

{Spiral shell}, any shell in which the whorls form a spiral or helix.

{Spiral spring}. See the Note under {Spring}, noun, 4.

From WordNet (r) 3.0 (2006) [wn]:

1: in the shape of a coil [syn: {coiling}, {helical}, {spiral}, {spiraling}, {volute}, {voluted}, {whorled}, {turbinate}]

noun

2: a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle [syn: {helix}, {spiral}]

3: a continuously accelerating change in the economy

4: ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center [syn: {spiral}, {volute}]

5: a structure consisting of something wound in a continuous series of loops; "a coil of rope" [syn: {coil}, {spiral}, {volute}, {whorl}, {helix}]

verb

1: to wind or move in a spiral course; "the muscles and nerves of his fine drawn body were coiling for action"; "black smoke coiling up into the sky"; "the young people gyrated on the dance floor" [syn: {gyrate}, {spiral}, {coil}]

2: form a spiral; "The path spirals up the mountain"

3: move in a spiral or zigzag course [syn: {corkscrew}, {spiral}]