helical

This term is primarily used in scientific, technical, and mathematical contexts to describe a specific geometric configuration. It carries a neutral, descriptive tone and is the precise term for structures that wind around a central axis, such as the double helix of DNA or the threading of a screw.

While "spiral" is often used interchangeably in casual conversation, "helical" is more rigorous. A helix maintains a constant radius from the axis as it rises, whereas a spiral typically moves inward or outward from a center point. Using "helical" instead of "spiral" signals a higher level of technical precision and academic register.