hel·i·cal

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

Origin:
1605–15; helic- + -al1

hel·i·cal·ly, adverb
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Collins
World English Dictionary
helical (ˈhɛlɪkəl) [Click for IPA pronunciation guide]
 
adj
of or shaped like a helix; spiral
 
'helically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Helical is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Medical Dictionary

helical hel·i·cal (hěl'ĭ-kəl, hē'lĭ-)
adj.

  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
As they are pushed upward by the swelling population underneath them, they make
  keratin, a helical protein.
They did this by linking together the helical columns with loops to restrict
  their motions.
Move an electron through a magnetic field and it follows a helical path not a
  straight one.
Loop theories may be related to helical string theories if one considers that a
  loop has a zero helical angle.
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