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3 definitions found
 for Pig iron
From The Collaborative International Dictionary of English v.0.48 :

  Iron \I"ron\ ([imac]"[u^]rn), n. [OE. iren, AS. [imac]ren,
     [imac]sen, [imac]sern; akin to D. ijzer, OS. [imac]sarn, OHG.
     [imac]sarn, [imac]san, G. eisen, Icel. [imac]sarn, j[=a]rn,
     Sw. & Dan. jern, and perh. to E. ice; cf. Ir. iarann, W.
     haiarn, Armor. houarn.]
     [1913 Webster]
     1. (Chem.) The most common and most useful metallic element,
        being of almost universal occurrence, usually in the form
        of an oxide (as hematite, magnetite, etc.), or a hydrous
        oxide (as limonite, turgite, etc.). It is reduced on an
        enormous scale in three principal forms; viz., cast
        iron, steel, and wrought iron. Iron usually appears
        dark brown, from oxidation or impurity, but when pure, or
        on a fresh surface, is a gray or white metal. It is easily
        oxidized (rusted) by moisture, and is attacked by many
        corrosive agents. Symbol Fe (Latin Ferrum). Atomic number
        26, atomic weight 55.847. Specific gravity, pure iron,
        7.86; cast iron, 7.1. In magnetic properties, it is
        superior to all other substances.
        [1913 Webster]
  
     Note: The value of iron is largely due to the facility with
           which it can be worked. Thus, when heated it is
           malleable and ductile, and can be easily welded and
           forged at a high temperature. As cast iron, it is
           easily fusible; as steel, is very tough, and (when
           tempered) very hard and elastic. Chemically, iron is
           grouped with cobalt and nickel. Steel is a variety of
           iron containing more carbon than wrought iron, but less
           that cast iron. It is made either from wrought iron, by
           roasting in a packing of carbon (cementation) or from
           cast iron, by burning off the impurities in a Bessemer
           converter (then called Bessemer steel), or directly
           from the iron ore (as in the Siemens rotatory and
           generating furnace).
           [1913 Webster]
  
     2. An instrument or utensil made of iron; -- chiefly in
        composition; as, a flatiron, a smoothing iron, etc.
        [1913 Webster]
  
              My young soldier, put up your iron.   --Shak.
        [1913 Webster]
  
     3. pl. Fetters; chains; handcuffs; manacles.
        [1913 Webster]
  
              Four of the sufferers were left to rot in irons.
                                                    --Macaulay.
        [1913 Webster]
  
     4. Strength; power; firmness; inflexibility; as, to rule with
        a rod of iron.
        [1913 Webster]
  
     5. (Golf) An iron-headed club with a deep face, chiefly used
        in making approaches, lifting a ball over hazards, etc.
        [Webster 1913 Suppl.]
  
     Bar iron. See Wrought iron (below).
  
     Bog iron, bog ore; limonite. See Bog ore, under Bog.
  
     Cast iron (Metal.), an impure variety of iron, containing
        from three to six percent of carbon, part of which is
        united with a part of the iron, as a carbide, and the rest
        is uncombined, as graphite. It there is little free
        carbon, the product is white iron; if much of the carbon
        has separated as graphite, it is called gray iron. See
        also Cast iron, in the Vocabulary.
  
     Fire irons. See under Fire, n.
  
     Gray irons. See under Fire, n.
  
     Gray iron. See Cast iron (above).
  
     It irons (Naut.), said of a sailing vessel, when, in
        tacking, she comes up head to the wind and will not fill
        away on either tack.
  
     Magnetic iron. See Magnetite.
  
     Malleable iron (Metal.), iron sufficiently pure or soft to
        be capable of extension under the hammer; also, specif., a
        kind of iron produced by removing a portion of the carbon
        or other impurities from cast iron, rendering it less
        brittle, and to some extent malleable.
  
     Meteoric iron (Chem.), iron forming a large, and often the
        chief, ingredient of meteorites. It invariably contains a
        small amount of nickel and cobalt. Cf. Meteorite.
  
     Pig iron, the form in which cast iron is made at the blast
        furnace, being run into molds, called pigs.
  
     Reduced iron. See under Reduced.
  
     Specular iron. See Hematite.
  
     Too many irons in the fire, too many objects or tasks
        requiring the attention at once.
  
     White iron. See Cast iron (above).
  
     Wrought iron (Metal.), the purest form of iron commonly
        known in the arts, containing only about half of one per
        cent of carbon. It is made either directly from the ore,
        as in the Catalan forge or bloomery, or by purifying
        (puddling) cast iron in a reverberatory furnace or
        refinery. It is tough, malleable, and ductile. When formed
        into bars, it is called bar iron.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Pig \Pig\, n. [Cf. D. big, bigge, LG. bigge, also Dan. pige
     girl, Sw. piga, Icel. p[imac]ka.]
     1. The young of swine, male or female; also, any swine; a
        hog. "Two pigges in a poke." --Chaucer.
        [1913 Webster]
  
     2. (Zool.) Any wild species of the genus Sus and related
        genera.
        [1913 Webster]
  
     3. [Cf. Sow a channel for melted iron.] An oblong mass of
        cast iron, lead, or other metal. See Mine pig, under
        Mine.
        [1913 Webster]
  
     4. One who is hoggish; a greedy person. [Low]
        [1913 Webster]
  
     Masked pig. (Zool.) See under Masked.
  
     Pig bed (Founding), the bed of sand in which the iron from
        a smelting furnace is cast into pigs.
  
     Pig iron, cast iron in pigs, or oblong blocks or bars, as
        it comes from the smelting furnace. See Pig, 4.
  
     Pig yoke (Naut.), a nickname for a quadrant or sextant.
  
     A pig in a poke (that is, bag), a blind bargain; something
        bought or bargained for, without the quality or the value
        being known. [Colloq.]
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  pig iron
      n 1: crude iron tapped from a blast furnace

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