helicoid

 
Pronunciation: /ˈhiːlɪkɔɪd/

noun

  • a helical or spiral object.
  • Geometry a surface formed by simultaneously moving a straight line along an axis and rotating it around it (like a screw thread).

adjective

  • of the form of a helix or helicoid.

Derivatives

helicoidal

Pronunciation: /hiːlɪˈkɔɪdəl/
adjective

Origin:

late 17th century: from Greek helikoeidēs 'of spiral form', from helix, helik- (see helix)