[hel-i-kuhl, hee-li-]
pertaining to or having the form of a helix; spiral.

1605–15; helic- + -al1

helically, adverb
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World English Dictionary
helical (ˈhɛlɪkəl)
of or shaped like a helix; spiral

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

helical hel·i·cal (hěl'ĭ-kəl, hē'lĭ-)

  1. Of or having the shape of a helix; spiral.

  2. Having a shape approximating that of a helix.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Move an electron through a magnetic field and it follows a helical path not a
  straight one.
One challenge people have faced with this motor is interfacing with the helical
  output gear.
He and his team are helping refine some mechanical aspects of a new tool, a
  helical needle for operating on brain tumors.
They did this by linking together the helical columns with loops to restrict
  their motions.
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