螺ら線せん

noun

helix

Mathematical term for a three-dimensional curve winding around a cylinder or cone, like a spring or screw thread.

• DNAは二に重じゅうらせん構こう造ぞうをしている。

  DNA has a double helix structure.

noun

spiral

Mathematical term for a curve winding around a fixed point while moving outward, like a snail shell or a whirlpool. Cross-referenced with 渦巻き線.

See also: 渦巻き線

• この図ず形けいはアルキメデスの螺ら線せんと呼よばれる。

  This figure is called Archimedes' spiral.