su·per·he·lix 
(spər-hē′lĭks)
(spər-hē′lĭks)n. pl. su·per·he·lix·es or su·per·hel·i·ces (hĕlĭ-sēz′, hēlĭ-)
A structure in which a helix is itself coiled into a helix, as in a DNA supercoil.
su′per·heli·cal (-hĕlĭ-kəl, -hēlĭ-) adj.
su′per·heli·cal·ly adv.