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Spiral   /spˈaɪrəl/   Listen
noun
Spiral  n.  
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.
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.



adjective
Spiral  adj.  
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.






Collaborative International Dictionary of English 0.48








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"Spiral" Quotes from Famous Books



... strange way, the old man cast his eyes on his bench. There lay all the pieces of a watch that he had carefully taken apart. He took up a sort of hollow cylinder, called a barrel, in which the spring is enclosed, and removed the steel spiral, but instead of relaxing itself, according to the laws of its elasticity, it remained coiled on itself like a sleeping viper. It seemed knotted, like impotent old men whose blood has long been congealed. Master Zacharius vainly ...
— A Winter Amid the Ice - and Other Thrilling Stories • Jules Verne

... attachment to be used in connection with the cutter head and saw table for cutting straight, spiral, or irregular flutes on turned work. It consists of a bar, D, carrying a central fixed arm, and at either end an adjustable arm, the purpose of the latter being to adapt the device to work of different lengths. The ...
— Scientific American Supplement, No. 312, December 24, 1881 • Various

... his light tent, built a fire, and went to sleep. He was up again at dawn. At two o'clock he came into the clearing about Lac Bain. As he hurried to Breed's quarters he wondered if Colonel Becker or Isobel had seen him from their window. He had noticed that the curtain was up, and that a thin spiral of smoke was rising from the clay chimney that descended to ...
— Philip Steele of the Royal Northwest Mounted Police • James Oliver Curwood

... lamps and Pennsylvania petroleum. Postal boxes after the Yankee custom were erected and in use. Gingham umbrellas were replacing those made of oiled paper. Barbers' poles, painted white with the spiral red band, were set up, and within the shops Young Japan had his queue cut off and his hair dressed in foreign style. Ignorant of the significance of the symbolic relic of the old days, when the barber was doctor and dentist also, ...
— Lippincott's Magazine of Popular Literature and Science, Vol. XII, No. 29. August, 1873. • Various

... the gold-red meteor of the prairie would shake his mane and tail and come careering, curvetting, not direct, but round in a brief spiral to find a period point at ...
— The Preacher of Cedar Mountain - A Tale of the Open Country • Ernest Thompson Seton


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