IPA: /ˌsuːpəˈhiːlɪk/
KK: /sjuːpəˈhiːlɪk/
Relating to a specific type of twisted structure that is formed by a helix being twisted into another helix.
The DNA molecule has a superhelical structure that helps it fit within the cell nucleus.
Superhelical → It is formed from "super-" (meaning above or over) and "helical" (from Greek "helix", meaning spiral). The word describes a structure that is in a spiral form that is above or beyond the normal helical structure.
Think of something that is 'above' ('super-') a regular spiral ('helical') — that's why superhelical refers to a more complex spiral structure.