supercoilPronunciation: /ˈsuːpəkɔɪl, ˈsjuː-/ BiochemistryDefinition of supercoil noun another term for superhelix. verb [with object] form (a substance) into a superhelix: (as adjective supercoiled)a supercoiled circular DNA moleculesupercoil in other Oxford dictionaries Definition of supercoil in the US English dictionary