Helical

a.

1.

Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring.

Adj.

1.

helical - in the shape of a coil Synonyms: coiling, spiral, spiraling, volute, voluted, whorled, turbinate

O-shaped, ambagious, anfractuous, backhanded, circuitous, circular, cochlear, cochleate, corkscrew, corkscrewy, deviating, deviative, devious, digressive, discursive, excursive, helicoid, indirect, meandering, oblique, orbital, out-of-the-way, rotary, round, roundabout, screw-shaped, scrolled, spiral, spiroid, turbinal, turbinate, verticillate, volute, voluted, whorled