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The Collaborative International Dictionary of English v.0.48 (gcide)

Helicoid \Hel"i*coid\, a. [Gr. ?; ?, ?, spiral ? shape: cf. F.
h['e]lico["i]de. See {Helix}.]
[1913 Webster]
1. Spiral; curved, like the spire of a univalve shell.
[1913 Webster]

2. (Zool.) Shaped like a snail shell; pertaining to the
{Helicid[ae]}, or Snail family.
[1913 Webster]

{Helicoid parabola} (Math.), the parabolic spiral.
[1913 Webster]


Helicoid \Hel"i*coid\, 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.
[1913 Webster]

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