[f. FLASH v.2; cf. FLASH sb.4] concr. (See quot. 1874.)
1782. Phil. Trans., LXXII. 359. At its junction with the wall a flashing of lead is carried along horizontally.
1842. in Gwilt, Encycl. Archit., § 2214.
1874. Knight, Dict. Mech., I. 876/2. Flashing.… (Plumbing.) a. A lap-joint used in sheet-metal roofing, where the edges of the sheets meet on a projecting ridge. b. A strip of lead leading the drip of a wall into a gutter.
