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单词 spiral
释义

WordReference Random House Learner's Dictionary of American English © 2024
spi•ral /ˈspaɪrəl/USA pronunciation   n., adj., v., -raled, -ral•ing or (esp. Brit.) -ralled, -ral•ling. 
n. [countable]
  1. Mathematicsa curve made by a point that moves around a fixed point, while constantly moving away from or toward that point.
  2. a spiral object, formation, or form.
  3. Businessa continuous increase or decrease in wages, prices, etc.

adj. [before a noun]
  1. of or of the nature of a spiral or coil:a spiral staircase.
  2. bound with a spiral binding:a spiral notebook.

v. [no object]
  1. to take a spiral form or course:The plane exploded and spiraled down to earth.
  2. to rise or fall steadily:Wages have spiraled down once again.

WordReference Random House Unabridged Dictionary of American English © 2024
spi•ral  (spīrəl),USA pronunciation n., adj., v., -raled, -ral•ing or (esp. Brit.) -ralled, -ral•ling. 
n. 
  1. Mathematics[Geom.]a plane curve generated by a point moving around a fixed point while constantly receding from or approaching it.
  2. Mathematicsa helix.
  3. Mathematicsa single circle or ring of a spiral or helical curve or object.
  4. a spiral or helical object, formation, or form.
  5. Aeronauticsa maneuver in which an airplane descends in a helix of small pitch and large radius, with the angle of attack within that of the normal flight range.
  6. [Football.]a type of kick or pass in which the ball turns on its longer axis as it flies through the air.
  7. Business[Econ.]a continuous increase in costs, wages, prices, etc. (inflationary spiral,) or a decrease in costs, wages, prices, etc. (deflationary spiral.)

adj. 
  1. Mathematicsrunning continuously around a fixed point or center while constantly receding from or approaching it; coiling in a single plane:a spiral curve.
  2. Mathematicscoiling around a fixed line or axis in a constantly changing series of planes;
    helical.
  3. of or of the nature of a spire or coil.
  4. bound with a spiral binding;
    spiral-bound:a spiral notebook.

v.i. 
  1. to take a spiral form or course.
  2. to advance or increase steadily;
    rise:Costs have been spiraling all year.
  3. Aeronauticsto fly an airplane through a spiral course.

v.t. 
  1. Aeronauticsto cause to take a spiral form or course.
  • Greek speîra anything coiled, wreathed, or twisted; see spire2) + -ālis -al1
  • Medieval Latin spīrālis, equivalent. to Latin spīr(a) coil (
  • 1545–55
spi•ral•i•ty  (spī rali tē),USA pronunciation n.  spiral•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::
spiral /ˈspaɪərəl/ n
  1. one of several plane curves formed by a point winding about a fixed point at an ever-increasing distance from it. Polar equation of Archimedes spiral:r = aθ; of logarithmic spiral: log r = aθ; of hyperbolic spiral:rθ = a, (where a is a constant)
  2. another name for helix
  3. something that pursues a winding, usually upward, course or that displays a twisting form or shape
  4. a flight manoeuvre in which an aircraft descends describing a helix of comparatively large radius with the angle of attack within the normal flight range
    Compare spin
  5. a continuous upward or downward movement in economic activity or prices, caused by interaction between prices, wages, demand, and production
adj
  1. having the shape of a spiral
vb ( -rals, -ralling, -ralled) ( US -rals, -raling, -raled)
  1. to assume or cause to assume a spiral course or shape
  2. (intransitive) to increase or decrease with steady acceleration: wages and prices continue to spiral
Etymology: 16th Century: via French from Medieval Latin spīrālis, from Latin spīra a coil; see spire²

ˈspirally adv
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