Spiral-nebula
noun, Astronomy.
1.
(formerly) a spiral galaxy.
Read Also:
- Spiral-of-archimedes
noun, Geometry. 1. 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 noun 1. (maths) a spiral having the equation r […]
- 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.
- Spiral-spring
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.