1. Having the shape of a helix; spiral or coiled in a three-dimensional curve.

Examples

• The DNA molecule has a helical structure with two intertwined strands.
• A helical staircase winds upward in a smooth, continuous spiral.
• The drill bit's helical grooves help it cut through wood efficiently.
• Helical gears are used in machinery to transmit power between shafts.
• The spring's helical design allows it to compress and expand smoothly.