a curve that is the locus of a point that moves outward with uniform speed along a vector, beginning at the origin, while the vector rotates about the origin with uniform angular velocity. Equation (in polar coordinates): r = aθ.
spiral of Archimedes
(maths) a spiral having the equation r = aθ, where a is a constant. It is the locus of a point moving to or from the origin at a constant speed along a line rotating around that origin at a constant speed
- Spiral organ
spiral organ n. A specialized structure located on the inner surface of the basilar membrane of the cochlea containing hair cells that transmit sound vibrations to the nerve fibers. Also called organ of Corti.
noun 1. a form of spring consisting of a wire coiled in a helix.
- Spiral staircase
noun 1. a staircase constructed around a central axis
- Spiral valve
spiral valve n. See spiral fold of cystic duct.