Definition

1. Noun:
   • A hard, brittle alloy of iron and carbon: Cast iron is an iron alloy containing a high carbon content (typically 2-4%), which makes it strong in compression but brittle and not malleable. It is produced by melting iron and then pouring it into a mold to solidify, a process called casting.

Usage

• Cast iron is primarily used to describe the material itself or objects made from it.
• It is often used attributively (like an adjective) before another noun to describe the material of that noun (e.g., cast iron skillet).

Examples

• Noun:
  • The old bridge was supported by massive cast iron pillars.
  • She seasoned her new cast iron pan before using it for the first time.
  • Cast iron is known for its excellent heat retention.

Advanced Usage

• "Cast-iron" (as a hyphenated adjective): Used figuratively to describe something that is very strong, certain, or unbreakable.
  • He had a cast-iron alibi for the night of the crime. (Meaning: an alibi that is very strong and certain)
  • She has a cast-iron stomach and can eat anything. (Meaning: a very strong digestive system)

Variants and Related Words

• Cast-iron (adj): The hyphenated form is standard when used as an adjective before a noun, especially in figurative contexts.
  • A cast-iron guarantee.
• Cast (verb): The process of pouring molten metal into a mold, from which "cast iron" gets its name.
• Wrought iron: A contrasting, malleable iron alloy with very low carbon content, shaped by hammering or rolling.

Synonyms

• Pig iron: A crude, high-carbon iron that is the direct product of a blast furnace and is often used to make cast iron. (Note: While related, "pig iron" is the raw material, and "cast iron" is the refined product for casting.)
• Ferrous alloy: A more general technical term for alloys based on iron.

Related Phrases

• Cast iron skillet/pan: A very common household item made of this material.
• Cast iron stomach: An idiom (see Advanced Usage) for a very strong digestive system.
• Cast-iron excuse/alibi: An idiom for an excuse or alibi that is perceived as undeniable or foolproof.

Noun

1. an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting