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Adjective: helicoid  'he-lu,koyd
  1. Spiral; in the shape of a helix
Noun: helicoid  'he-lu,koyd
  1. 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

Derived forms: helicoids

Encyclopedia: Helicoid