\Flash"ing\, n.
1. (Engineering) The creation of an artifical flood by the
   sudden letting in of a body of water; -- called also
   {flushing}.
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}.
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.
{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[deg] 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.