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Meaning Of Helicoid
a.
Spiral; curved, like the spire of a univalve shell.
a.
Shaped like a snail shell; pertaining to the Helicidae,
or Snail family.
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 in the direction of another fixed straight line, and at
the same time a uniform angular motion about it.