Geometry. the curve formed by a straight line drawn on a plane when that plane is wrapped around a cylindrical surface of any kind, especially a right circular cylinder, as the curve of a screw. Equation: x = a sinθ, y = a cosθ, z = b θ.
Architecture. a. a spiral ornament. b. (in a Corinthian capital) either of two scrolls issuing from a cauliculus. Compare Corinthian (def. 2).
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Citations for helix
What Wilkins described on that occasion was evidence he had obtained which suggested that DNA had the form of a helix, rather like a spiral staircase.Jim Holt, "Photo Finish," The New Yorker, October 28, 2002
But what's different here is the blades are canted into a helix with a twist of sixty degrees.Ian McEwan, Solar, 2010