n. Any circular ornament having many small parts in concentric circles, or regularly arranged around the center.n. Specifically— In architecture, an ornament of frequent use in decoration in all styles. In Roman architecture rosettes decorate coffers in ceilings and soffits of cornices, and appear as a central ornament of the abacus of the Corinthian order. In medieval architecture rosettes are abundant, and consist usually of a knot of foliage inscribed in a circle, trefoil, or quatrefoil. See also cut under patera.n. A knot of ribbon or a bunch of colored worsted used as an ornament of costume, especially one of the two bunches of ribbons attached to the loops by which an officer's gorget was suspended on his chest.n. Any object or arrangement resembling in form a full-blown rose.n. Same as roset.n. In zoology and anatomy, a natural formation of parts resembling a rose. See rose, 9.n. A curve whose polar equation is r = a + sin mθ, which presents a great variety of forms symmetrical about a center.n. Nautical, a form of knot.n. In metallurgy, a disk or plate formed by throwing water on melted metal. See rosette-copper, and compare quenching, 2.n. n. In electricity: A cluster of glow-lamps or of sockets arranged for the mounting of such lamps.n. An electrical fixture used when a branch is to be taken from the main wires. It consists, usually, of a porcelain base, which is fastened to a ceiling or other support, and a porcelain cover through a hole in which the branch wires run. Removing the cover disconnects the branch wires from the mains.