What do a.m. and p.m. stand for?

pig iron

iron tapped from a blast furnace and cast into pigs in preparation for conversion into steel, cast iron, or wrought iron.
iron in the chemical state in which it exists when tapped from the blast furnace, without alloying or refinement.
Origin of pig iron
1655-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pig iron
  • There are plans to build a pig iron plant on, or near, this property.
  • Coke and iron, the raw materials, were combined in a blast furnace to make liquid pig iron.
  • The blast furnace product is usually referred to as pig iron.
  • They are improving the quality of the steel they make by melting pig iron along with the scrap.
  • The remainder is poured into molds to produce pig iron.
  • pig iron production also is concentrated in a few countries.
  • pig iron is then produced by heating the coke, iron ore, and limestone in a blast furnace.
  • These comparisons are exclusive of silvery pig iron, statistics for which were not published to avoid disclosing proprietary data.
  • pig iron was produced in a blast furnace fueled by charcoal which was manufactured on site.
  • The facility will use a rotary hearth furnace for the production of impure zinc concentrate and pig iron.
British Dictionary definitions for pig iron

pig iron

crude iron produced in a blast furnace and poured into moulds in preparation for making wrought iron, steels, alloys, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pig iron

1660s; see pig (n.) + iron (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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