Helix/ˈhiːlɪks/ Definition 1 of 3Pro Tip 1/3Scientific Usage Used often in scientific contexts, especially biology and engineering. Researchers modeled the protein in a helix form for clarity. Pro Tip 2/3Geometric Shape Represents a three-dimensional curved shape, like a spring or staircase. The architect designed a helix staircase for the building's lobby. Pro Tip 3/3Descriptive Imagery Invokes a visual spiral image, often used in creative and descriptive writing. The vine grew in a tight helix around the old tree trunk.