pig iron

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Crude iron cast in blocks.

from The Century Dictionary.

• noun Iron in pigs, as it comes from the blast-furnace. See pig, 3.
• noun A flat piece of iron, which is hung so as to be interposed between the fire and meat roasting, when it is desirable to retard the cooking.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A type of crude iron shaped like a block, commonly used as an industrial raw material.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun crude iron tapped from a blast furnace