Mill

(1) A factory in which metals are hot worked, cold worked, or melted and cast into standard shapes suitable for secondary fabrication into commercial products. (2) A production line, usually of four or more stands, for hot or cold rolling metal into standard shapes such as bar, rod, plate, sheet, or strip. (3) A single machine for hot rolling, cold rolling, or extruding metal; examples include blooming mill, cluster mill, four-high mill, and Sendzimer mill. (4) A shop term for a milling cutter. (5) A machine or group of machines for grinding or crushing ores and other minerals.

Source: The OHIO State University