Refers to a curve winding around a central point or axis, including both 2D spirals and 3D helices. Common in geometry, biology, and everyday description.
DNA has a double helix structure.
The stairs continue upward in a spiral.
Specifically refers to a screw thread or a screw-shaped object. Often used in mechanical contexts; compare with ねじ for a more general 'screw' as a fastener.
See also: ネジ
This part has a fine screw thread cut into it.
The vine grows in a spiral shape as it climbs.
Cut a screw thread into the surface of the bolt.
spiral staircase
screw propeller
screw pump