1. a three-dimensional curve that winds around a cylinder or cone in a spiral pattern
Usage: geometry; mathematics
2. the curved outer rim of the ear
Usage: anatomy
3. the twisted structure of DNA or other biological molecules
Usage: biology; biochemistry

Examples

• The DNA molecule forms a double helix structure.
• The staircase wound upward in a perfect helix.
• She got a piercing in the helix of her ear.
• The protein folded into a complex helix pattern.
• The spring coiled in a tight helix shape.
• Scientists studied the helix formation in the crystal.
• The vine grew around the pole in a natural helix.