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Meaning of HELICOID

Webster's 1913 Dictionary
  1. \Hel"i*coid\, a. [Gr. ?; "e`lix, -ikos, spiral + ?
    shape: cf. F. h['e]lico["i]de. See {Helix}.]
    1. Spiral; curved, like the spire of a univalve shell.
    2. (Zo["o]l.) Shaped like a snail shell; pertaining to the
       {Helicid[ae]}, or Snail family.
    {Helicoid parabola} (Math.), the parabolic spiral.
  2. \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.
Biology Dictionary
 Definition: Coiled; of a cymose inflorescence, branching repeatedly on the same side.