Helicoid /(?)/

Hel·i·coid

Helicoid

a.
  1. Spiral; curved, like the spire of a univalve shell.
  2. Shaped like a snail shell; pertaining to the Helicidae, or Snail family. (Zool.)

Phrases & Compounds
Helicoid parabola
the parabolic spiral.

Helicoid

n.
  1. A warped surface which may be generated by a straight line moving in such a manner that every point of the line shall have a uniform motion in the direction of another fixed straight line, and at the same time a uniform angular motion about it. (Geom.)