— helicoidal , adj. — helicoidally , adv.
/hel"i koyd', hee"li-/ , adj.
1. coiled or curving like a spiral.
n.
2. Geom. a warped surface generated by a straight line moving so as to cut or touch a fixed helix.
[ 1690-1700; helikoeidés of spiral form. See HELIC-, -OID ]