Helicoid

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.


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From 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}.]
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     1. Spiral; curved, like the spire of a univalve shell.
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     2. (Zool.) Shaped like a snail shell; pertaining to the
        {Helicid[ae]}, or Snail family.
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     {Helicoid parabola} (Math.), the parabolic spiral.
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