flashing

n. 1. (Engineering) The creation of an artificial flood by the sudden letting in of a body of water; -- called also flushing. [ 1913 Webster ]

2. (Arch.) 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. [ 1913 Webster ]

3. (Glass Making) (a) 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. (b) A mode of covering transparent white glass with a film of colored glass. Knight. [ 1913 Webster ]

Flashing point (Chem.), that degree of temperature at which a volatile oil gives off vapor in sufficient quantity to burn, or flash, on the approach of a flame, used as a test of the comparative safety of oils, esp. kerosene; a flashing point of 100° F. is regarded as a fairly safe standard. The burning point of the oil is usually from ten to thirty degree above the flashing point of its vapor. Usually called flash point. [ 1913 Webster ]