SPIRALS

Noun

spirals

plural of spiral

Source: Wiktionary

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SPIRAL

Spi"ral, a. Etym: [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.)

Definition: 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 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.

Spi"ral, n. Etym: [Cf. F. spirale. See Spiral, a.]

1. (Geom.)

Definition: 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.

2. 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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