MILL Mill, n. Etym: [OE. mille, melle, mulle, milne, AS. myln, mylen; akin to D. molen, G. mühle, OHG. muli, mulin, Icel. mylna; all prob. from L. molina, fr. mola millstone; prop., that which grinds, akin to molere to grind, Goth. malan, G. mahlen, and to E. meal. Meal flour, and cf. Moline.]
1. A machine for grinding or commuting any substance, as grain, by rubbing and crushing it between two hard, rough, or intented surfaces; as, a gristmill, a coffee mill; a bone mill.
2. A machine used for expelling the juice, sap, etc., from vegetable tissues by pressure, or by pressure in combination with a grinding, or cutting process; as, a cider mill; a cane mill.
3. A machine for grinding and polishing; as, a lapidary mill.
4. A common name for various machines which produce a manufactured product, or change the form of a raw material by the continuous repetition of some simple action; as, a sawmill; a stamping mill, etc.
5. A building or collection of buildings with machinery by which the processes of manufacturing are carried on; as, a cotton mill; a powder mill; a rolling mill.
6. (Die Sinking)
Defn: A hardened steel roller having a design in relief, used for imprinting a reversed copy of the design in a softer metal, as copper.
7. (Mining) (a) An excavation in rock, transverse to the workings, from which material for filling is obtained. (b) A passage underground through which ore is shot.
8. A milling cutter. See Illust. under Milling.