milling

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act or process of grinding, especially grinding grain into flour or meal.
• noun The operation of cutting, shaping, finishing, or working products manufactured in a mill.
• noun The ridges cut on the edges of coins.

from The Century Dictionary.

• noun The process of grinding, or subjecting materials to the action of the machinery of a grinding-mill. Specifically
• noun The manufacture of cereals into flour or meal.
• noun The operation of upsetting the edge of a coin-blank to form the milled edge; also, the operation of putting the series of small transverse ridges and furrows on the edge of an otherwise finished coin, or on a screw-head to adapt it for easy turning with the fingers. See milled screw, under screw.
• noun A method of shaping metals in a milling-machine, by passing the metal under a serrated revolving cylinder or cutter
• noun In metal-working, a method of ornamenting metallic surfaces by treatment in a lathe with ribbed tools, which produce ridged surfaces.
• noun A method of softening and opening the pores of hides by placing them with some tan-liquor in a wooden drum which is caused to revolve.
• noun The felting or fulling of a cloth to thicken it.
• noun In pottery, the operation of grinding and mixing the slip.
• noun A thrashing; a fight; a beating.
• noun The act of playing around in a circle: said of a school of fish. Also called cart-wheeling.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act or employment of grinding or passing through a mill; the process of fulling; the process of making a raised or intented edge upon coin, etc.; the process of dressing surfaces of various shapes with rotary cutters. See mill.
• noun milling in which grain is reduced to flour by a succession of crackings, or of slight and partial crushings, alternately with sifting and sorting the product.
• noun milling in which the reduction is effected in a single crushing or grinding.
• noun a fluted, sharp-edged rotary cutter for dressing surfaces, as of metal, of various shapes.
• noun a machine tool for dressing surfaces by rotary cutters.
• noun a roller with indented edge or surface, for producing like indentations in metal by rolling pressure, as in turning; a knurling tool; a milling cutter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The notches around the edge of a coin, placed there during minting so that it can be told if some of the metal from the edge is removed. Removing metal from a coin was common practice during earlier times when coins made of precious metals circulated.
• verb Present participle of mill.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun corrugated edge of a coin