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Hel"icoid (), a.[Gr. ; "e°lix, -ikos, spiral + shape: cf. F. hlicode. See Helix.] 1. Spiral; curved, like the spire of a univalve shell. 2. (Zol.) Shaped like a snail shell; pertaining to the Helicid, or Snail family. Helicoid parabola (Math.), the parabolic spiral.
Hel"icoid n.(Geom.) 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.
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