cast iron means: Cast iron is one of the most ancient materials for cooking. It provides even heat and can be used to cook for long periods. Cast iron can be used for cooking delicate foods like eggs and stews, as long as it is properly seasoned. (in Cooking Dictionary)

What else does cast iron mean?

This is a hard, brittle and non-malleable iron carbon alloy. It contains 2 to 4.5% carbon and 0.5 to 3.3% silicon. There are also lesser amounts of sulfur and manganese. (in Merlin Dictionary)