Definition of Spirel
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.
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
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. [Cf. F. spirale.
See Spiral, a.] 1.
(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.
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.
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.
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
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. [Cf. F. spirale.
See Spiral, a.] 1.
(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.
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.
- Webster's Unabridged Dictionary (1913)
- (geometry) A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
- (informally) A helix.
- To move along the path of a spiral or helix.
The falling leaves spiralled down from the tree.
- (figurative) To increase continually.
Her debts were spiralling out of control.
Northern Sami
- hip
- The Nuttall Encyclopedia
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