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Helicoidal :: Helicoidal (a.) Same as Helicoid.

Helicoid :: Helicoid (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..

Screw :: Screw (n.) Anything shaped or acting like a screw; esp., a form of wheel for propelling steam vessels. It is placed at the stern, and furnished with blades having helicoidal surfaces to act against the water in the manner of a screw. See Screw propeller, below..

Helicoid :: Helicoid (a.) Spiral; curved, like the spire of a univalve shell..

Helicine :: Helicine (a.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.

Helicoid :: Helicoid (a.) Shaped like a snail shell; pertaining to the Helicidae, or Snail family..

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