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Word meaning 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.


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