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whorl noun

  /(h)wɔː(ɹ)l/ , /(h)wɜː(ɹ)l/
  • A flywheel, a weight attached to a spindle. [from c. 1460]
fusaïole
  • (zoology) A volution, or turn, of the spire of a univalve shell.
tour de spire
  • (botany) A circle of three or more leaves, flowers, or other organs, about the same part or joint of a stem.
verticille
  • Each circle, volution or equivalent in a pattern of concentric circles, ovals, arcs, or a spiral.
volute
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