I. ˈhelə̇kəl, -lēk- also ˈhēl- adjective
Etymology: helic- + -al
1. : of, relating to, or having the form of a helix ; broadly : spiral 1a
the helical thread of a bolt
metal tubing with annular or helical fins
2. : having the angle of a helix formed about the pitch cylinder rather than being straight and parallel to the axis (as of a gear or milling cutter)
helical teeth
gears cut in a helical rather than a spur shape for smoother operation
II. noun
( -s )
: something helical in form (as a coil extension spring)