(photog) a type of electronic flash in which the light source is arranged in a ring around the lens in order to produce a light without shadows
noun 1. ring-spinning frame. ring-spinning frame [ring-spin-ing] /ˈrɪŋˌspɪn ɪŋ/ noun 1. a machine containing the ring, traveler, and bobbin used in spinning yarn.
noun 1. a gage for checking the diameters of circular manufactured objects, consisting of a ring having a hole that is of either the maximum or minimum allowable diameter.
noun, Astronomy. 1. a galaxy having the shape of an elliptical ring: thought to be the result of a collision of two galaxies.
noun, Metallurgy. 1. a gate having a widened opening containing a centered disk to prevent molten metal from falling in a direct vertical stream.