Backing

[1] Some material placed on the root side of a weld to aid control of penetration.
[2] Light-absorbent layer on the rear surface of photographic film or plate to reduce halation
[3] A meterological term describing the changing of a wind in a counter-clockwise direction. See veering
[4] The binding process by which one half of the sections at the back of a volume are bent over to the right and the other half to the left. The projections formed are joints, to which the case is hinged, by hand or machine. Some machines also simultaneously perform rounding See also steel backing