castiron
adjectiveUK /ˌkɑːst ˈaɪən/
US /ˌkæst ˈaɪərn/
Cast iron is a very hard, heavy metal used to make strong pans and pots.
Grandma cooked the pancakes in a heavy cast-iron skillet.
OTHER MEANINGS
2. Very strong and not willing to change.
The coach had a cast-iron rule about being on time.
3. Certain and impossible to doubt.
She had a cast-iron excuse for missing the bus.
4. A hard type of iron made by melting and shaping it.
The old bridge was built from cast iron.