1828 dictionary Noah Webster's 1828 American Dictionary 1828 webster
Noah Webster's 1828 American Dictionary
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1828 dictionary(3) Words.

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S  ›  spiral
S  ›  spiral
1828 Definition

SPI'RAL, a. [L. spira, a spire.] Winding round a cylinder or other round body, or in a circular form, and at the same time rising or advancing forward; winding like a screw. The magnificent column in the Place Vendeme, at Paris, is divided by a spiral line into compartments. It is formed with spiral compartments, on which are engraved figures emblematical of the victories of the French armies. A whirlwind is so named from the spiral motion of the air. Water in a tunnel descends in a spiral form.

1913 Definition
Spiral (spiral)
a.(?)
Spi"ral
[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. 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.

  4. 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.
  5. 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.


1828 dictionary
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