noun
- 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.
noun
- crude iron produced in a blast furnace and poured into moulds in preparation for making wrought iron, steels, alloys, etc
n.1660s; see pig (n.) + iron (n.).