Flashing

1. Pieces of metal, built into the joints of a wall, so as to lap over the edge of the gutters or to cover the edge of the roofing; also, similar pieces used to cover the valleys of roofs of slate, shingles, or the like. By extension, the metal covering of ridges and hips of roofs; also, in the United States, the protecting of angles and breaks in walls of frame houses with waterproof material, tarred paper, or the like. Cf. Filleting.
2. of Flash
3. A mode of covering transparent white glass with a film of colored glass.
4. The creation of an artifical flood by the sudden letting in of a body of water; -- called also flushing.
5. The reheating of an article at the furnace aperture during manufacture to restore its plastic condition; esp., the reheating of a globe of crown glass to allow it to assume a flat shape as it is rotated.