Flat \Flat\, v. t. [imp. & p. p. Flatted; p. pr. & vb. n. Flatting.]

1. To make flat; to flatten; to level.

2. To render dull, insipid, or spiritless; to depress.

Passions are allayed, appetites are flatted. --Barrow.

3. To depress in tone, as a musical note; especially, to lower in pitch by half a tone.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Flatting \Flat"ting\, n.

1. The process or operation of making flat, as a cylinder of glass by opening it out.

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

3. A method of preserving gilding unburnished, by touching with size. --Knolles.

4. The process of forming metal into sheets by passing it between rolls.

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 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.

Source: Webster's Revised Unabridged Dictionary (1913)