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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



... steep and, panting but elated, gained the very foot of the pine, did the eagle stir. Then, spreading his wings with a slow disdain, as if not dread but aversion to this unbidden visitor bade him go, he launched himself on a long, splendid sweep over the gulf, and then mounted on a spacious spiral to his inaccessible outlook in the blue. Leaning against the bleached and scarred trunk of the pine, Horner watched this majestic departure for some minutes, recovering his breath and drinking deep ...
— Kings in Exile • Sir Charles George Douglas Roberts

... whose lilies lie Like maidens in the lap of death, So pale, so cold, so motionless Its Stygian breast they press; They breathe, and toward the purple sky The pallid perfumes of their breath Ascend in spiral shapes, for there No wind disturbs the voiceless air— No murmur breaks the oblivious mood Of that tenebrean solitude— No Djinn, no Ghoul, no Afrit laves His giant limbs within its waves Beneath the wan Saturnian light That swoons in the omnipresent night; But only funeral forms ...
— Graham's Magazine Vol XXXII. No. 3. March 1848 • Various

... man, "it will be best for you to cross our Valley and mount the spiral staircase inside the Pyramid Mountain. The top of that mountain is lost in the clouds, and when you reach it you will be in the awful Land of ...
— Dorothy and the Wizard in Oz • L. Frank Baum.

... the nebulae are intensely cold. However, the majority of the nebulae that have been examined are not gaseous, and have a very different structure from the loose and diffused clouds of gas. They show two (possibly more, but generally two) great spiral arms starting from the central part and winding out into space. As they are flat or disk-shaped, we see this structure plainly when they turn full face toward the earth, as does the magnificent nebula ...
— The Story of Evolution • Joseph McCabe

... the temperature; and during the early part of May the worms attract attention by the innumerable small holes they make in the leaves. Their colors are dirty yellow and gray- green, and when not feeding, they rest on the under side of the leaf, curled up in a spiral manner, the tail occupying the centre, and fall to the ground at the slightest disturbance. After changing their skin four times they become fully grown, when they measure about ...
— Success With Small Fruits • E. P. Roe


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