n. 1. The process or operation of making flat, as a cylinder of glass by opening it out. [ 1913 Webster ]

2. A mode of painting, in which the paint, being mixed with turpentine, leaves the work without gloss. Gwilt. [ 1913 Webster ]

3. A method of preserving gilding unburnished, by touching with size. Knolles. [ 1913 Webster ]

4. The process of forming metal into sheets by passing it between rolls. [ 1913 Webster ]

Flatting coat, a coat of paint so put on as to have no gloss. --
Flatting furnace. Same as flattening oven, under Flatten. --
Flatting mill. (a) A rolling mill producing sheet metal; esp., in mints, the mill producing the ribbon from which the planchets are punched. (b) A mill in which grains of metal are flatted by steel rolls, and reduced to metallic dust, used for purposes of ornamentation. [ 1913 Webster ]