Furnace/ˈfɜːrnɪs/ Definition 1 of 3Pro Tip 1/3Industrial Use Often found in industrial settings where intense heat is needed for production. Large factories have furnaces to melt steel for manufacturing. Pro Tip 2/3Extreme Temperatures Refers to high heat environments, capable of melting metals or glass. Safety gear is necessary when operating a furnace because of the extreme heat. Pro Tip 3/3Specialized Workplaces Frequently used by specific professions like blacksmiths or glassblowers. The blacksmith worked by the furnace to create horseshoes.