superhelix; supercoil
Technical term in molecular biology and biochemistry for a higher-order helical structure, such as the coiling of DNA.
DNA can adopt a superhelical structure.
This enzyme has the function of unwinding supercoils.
Common mixed kanji-kana spelling for this technical term.
Full kanji spelling; 螺旋 is a standard kanji compound for 'helix'.
Compound of 超 (super-) and らせん (helix). A straightforward technical coinage.