blast furnace

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

• noun A furnace in which combustion is intensified by a blast of air, especially a furnace for smelting iron by blowing air through a hot mixture of ore, coke, and flux.

from The Century Dictionary.

• noun A furnace, usually vertical, or a so-called shaft-furnace, in which ores are smelted by the aid of a blast of air. See furnace.

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

• noun a furnace in which iron ore is smelted to iron; the process being intensified by a blast of hot air

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

• noun a furnace for smelting of iron from iron oxide ores; combustion is intensified by a blast of air