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helical adjective

  /ˈhiː.lɪ.kəl/ , /ˈhɛl.ɪ.kəl/
  • In the shape of a helix.
 спиральный

helix noun

  /ˈhiːlɪks/
  • (anatomy) The incurved rim of the external ear.
 винтова́я ли́ния, завито́к, спира́ль
  • (mathematics) A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
 винтова́я ли́ния, спира́ль
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