Define Spiral using "exact" search strategy.
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| Source: gcide | Spiral \Spi"ral\, n. [Cf. F. spirale. See {Spiral}, a.] 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}. [1913 Webster]
2. Anything which has a spiral form, as a spiral shell. [1913 Webster]
{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. [1913 Webster]
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| Source: gcide | Spiral \Spi"ral\, a. [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. [1913 Webster]
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. [1913 Webster]
3. (Geom.) Of or pertaining to a spiral; like a spiral. [1913 Webster]
{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. [1913 Webster]

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