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Entry 3 senses · 2 variants Webster, 1913

Helicoid

· Hel·i·coid · IPA
01 a. Spiral; curved, like the spire of a univalve shell.
  1. 1.
    Spiral; curved, like the spire of a univalve shell.
  2. 2.
    Shaped like a snail shell; pertaining to the Helicidae, or Snail family.(Zool.)
Phrases & compounds
Helicoid parabola — the parabolic spiral.
02 n. 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…
  1. 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.)