noun, plural helices [hel-uh-seez], helixes.
1. a spiral.
2. 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.
a) a spiral ornament.
b) (in a Corinthian capital) either of two scrolls issuing from a cauliculus. Compare Corinthian (def 2).
4. Anatomy. the curved fold forming most of the rim of the external ear.
5. Biochemistry, alpha helix.
Origin: 1555-65; < Latin: a spiral, a kind of ivy < Greek hélix anything twisted; compare helíssein to turn, twist, roll
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