'Helical' definitions:

Definition of 'helical'

From: WordNet
adjective
In the shape of a coil [syn: coiling, helical, spiral, spiraling, volute, voluted, whorled, turbinate]

Definition of 'Helical'

From: GCIDE
  • Helical \Hel"i*cal\, a. [From Helix.] Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring. -- {Hel"i*cal*ly}, adv. [1913 Webster]