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Mill (Machine for grinding grain)

a machine for grinding grain, fruit, or other substances, and reducing them to a fine powder. Also a lapidary's grinding wheel, known as roughing mill, cloth mill, etc. Also a machine, or complication of engines or machinery, for working up raw material. In die-sinking, the hardened steel roller having the design in cameo, and used for impressing in intaglio a plate, as in the bank-note system of engraving; or a copper cylinder, as in the process of engraving cylinders for calico printing.