Source : Webster's Revised Unabridged Dictionary (1913)

Mill \Mill\, n. [OE. mille, melle, mulle, milne, AS. myln,
   mylen; akin to D. molen, G. m["u]hle, OHG. mul[=i], mul[=i]n,
   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. [root]108. See Meal flour,
   and cf. {Moline}.]
   1. A machine for grinding or comminuting 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) 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}.

   9. A pugilistic. [Cant] --R. D. Blackmore.

   {Edge mill}, {Flint mill}, etc. See under {Edge}, {Flint},
      etc.

   {Mill bar} (Iron Works), a rough bar rolled or drawn directly
      from a bloom or puddle bar for conversion into merchant
      iron in the mill.

   {Mill cinder}, slag from a puddling furnace.

   {Mill head}, the head of water employed to turn the wheel of
      a mill.

   {Mill pick}, a pick for dressing millstones.

   {Mill pond}, a pond that supplies the water for a mill.

   {Mill race}, the canal in which water is conveyed to a mill
      wheel, or the current of water which drives the wheel.

   {Mill tail}, the water which flows from a mill wheel after
      turning it, or the channel in which the water flows.

   {Mill tooth}, a grinder or molar tooth.

   {Mill wheel}, the water wheel that drives the machinery of a
      mill.

   {Roller mill}, a mill in which flour or meal is made by
      crushing grain between rollers.

   {Stamp mill} (Mining), a mill in which ore is crushed by
      stamps.

   {To go through the mill}, to experience the suffering or
      discipline necessary to bring one to a certain degree of
      knowledge or skill, or to a certain mental state.

Stamp \Stamp\, n.
   1. The act of stamping, as with the foot.

   2. The which stamps; any instrument for making impressions on
      other bodies, as a die.

            'T is gold so pure It can not bear the stamp without
            alloy.                                --Dryden.

   3. The mark made by stamping; a mark imprinted; an
      impression.

            That sacred name gives ornament and grace, And, like
            his stamp, makes basest metals pass.  --Dryden.

   4. that which is marked; a thing stamped.

            hanging a golden stamp about their necks. --Shak.

   5. [F. estampe, of german origin. See {Stamp}, v. t.] A
      picture cut in wood or metal, or made by impression; a
      cut; a plate. [Obs.]

            At Venice they put out very curious stamps of the
            several edifices which are most famous for their
            beauty and magnificence.              --Addison.

   6. An offical mark set upon things chargeable with a duty or
      tax to government, as evidence that the duty or tax is
      paid; as, the stamp on a bill of exchange.

   7. Hence, a stamped or printed device, issued by the
      government at a fixed price, and required by law to be
      affixed to, or stamped on, certain papers, as evidence
      that the government dues are paid; as, a postage stamp; a
      receipt stamp, etc.

   8. An instrument for cutting out, or shaping, materials, as
      paper, leather, etc., by a downward pressure.

   9. A character or reputation, good or bad, fixed on anything
      as if by an imprinted mark; current value; authority; as,
      these persons have the stamp of dishonesty; the Scriptures
      bear the stamp of a divine origin.

            Of the same stamp is that which is obtruded on us,
            that an adamant suspends the attraction of the
            loadstone.                            --Sir T.
                                                  Browne.

   10. Make; cast; form; character; as, a man of the same stamp,
       or of a different stamp.

             A soldier of this season's stamp.    --Shak.

   11. A kind of heavy hammer, or pestle, raised by water or
       steam power, for beating ores to powder; anything like a
       pestle, used for pounding or bathing.

   12. A half-penny. [Obs.] --au. & Fl.

   13. pl. Money, esp. paper money. [Slang, U.S.]

   {Stamp act}, an act of the British Parliament [1765] imposing
      a duty on all paper, vellum, and parchment used in the
      American colonies, and declaring all writings on unstamped
      materials to be null an void.

   {Stamp collector}, an officer who receives or collects stamp
      duties; one who collects postage or other stamps.

   {Stamp duty}, a duty, or tax, imposed on paper and parchment
      used for certain writings, as deeds, conveyances, etc.,
      the evidence of the payment of the duty or tax being a
      stamp. [Eng.]

   {Stamp hammer}, a hammer, worked by power, which rises and
      falls vertically, like a stamp in a stamp mill.

   {Stamp head}, a heavy mass of metal, forming the head or
      lower end of a bar, which is lifted and let fall, in a
      stamp mill.

   {Stamp mill} (Mining), a mill in which ore is crushed with
      stamps; also, a machine for stamping ore.

   {Stamp note}, a stamped certificate from a customhouse
      officer, which allows goods to be received by the captain
      of a ship as freight. [Eng.]

   {Stamp office}, an office for the issue of stamps and the
      reception of stamp duties.

Source : WordNet®

stamp mill
     n : a mill in which ore is crushed with stamps [syn: {stamping
         mill}]