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Definition of helix
noun (plural helices /-ləˌsēz/)
an object having a three-dimensional shape like that of a wire wound uniformly in a single layer around a cylinder or cone, as in a corkscrew or spiral staircase. Geometry a curve on a conical or cylindrical surface that would become a straight line if the surface were unrolled into a plane. Biochemistry an extended spiral chain of atoms in a protein, nucleic acid, or other polymeric molecule. Architecture a spiral ornament. Anatomy the rim of the external ear.