# helix

/ˈhiɫɪks/ (US) · /hˈiːlɪks/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/helix
Updated: 2026-05-07

## Definition

a shape like a corkscrew or a spiral staircase. You see this shape in things like springs or the structure of DNA.

For teachers: a three-dimensional curve that lies on a cylinder or cone, such that its angle to a plane perpendicular to the axis is constant. Often used to describe biological structures or mechanical components.

## Examples

- The stairs wind upward in a tight helix.
- Scientists discovered that the structure of DNA is a double helix, resembling a twisted ladder.
- The architect incorporated a glass helix into the center of the building, allowing natural light to spiral down through every floor of the gallery.

## Usage notes

- The plural form can be either 'helixes' or the more technical 'helices'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.