Spiral

Spi´ral

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

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

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

Spiral gear
(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 gearing
a kind of gearing sometimes used in light machinery, in which spiral gears, instead of bevel gears, are used to transmit motion between shafts that are not parallel.

Spiral operculum
an operculum whih has spiral lines of growth.

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

Spiral spring
See the Note under Spring, n., 4.

(Geom.) A plane curve, not reëntrant, 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.

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

Equiangular spiral
a plane curve which cuts all its generatrices at the same angle. Same as Logarithmic spiral, under Logarithmic.

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

Noun	1.	spiral - a plane curve traced by a point circling about the center but at ever-greater distances from it
	2.	spiral - a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle Synonyms: helix
	3.	spiral - ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center Synonyms: volute
	4.	spiral - a structure consisting of something wound in a continuous series of loops; "a coil of rope" Synonyms: coil, helix, volute, whorl
	5.	spiral - flying downward in a helical path with a large radius
Verb	1.	spiral - 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" Synonyms: coil, gyrate
	2.	spiral - form a spiral; "The path spirals up the mountain"
	3.	spiral - move in a spiral or zigzag course Synonyms: corkscrew
Adj.	1.	spiral - in the shape of a coil Synonyms: coiling, helical, spiraling, volute, voluted, whorled, turbinate

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