Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of helicoidal is as below...

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

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..

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