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1. Oxford American Dictionary

   helicoid

   • IPA[ˈheləˌkoid]

   美式

   • n.
     an object of spiral or helical shape.；a surface formed by simultaneously moving a straight line along an axis and rotating it around it (like a screw thread).
   • adj.
     of the form of a helix or helicoid.

   • noun: helicoid, plural noun: helicoids

2. • 釋義

   n.

   名詞

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

   adj.

   形容詞

   • 1. of the form of a helix or helicoid.