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Adjective: helical  he-li-kul or hee-li-kul
  1. In the shape of a coil
    "A helical spring is depicted by providing thickness to a helix"
    - coiling, spiral, spiraling [US], volute, voluted, whorled, turbinate, spiralling [Brit, Cdn]

See also: coiled, helix

Encyclopedia: Helical