1. a hard coating or layer formed on a surface, especially by the deposit of mineral matter
2. the process of forming such a coating or crust

Examples

• The old pipes were clogged with calcium incrustation.
• Salt incrustation covered the rocks near the shore.
• The archaeologist carefully removed the incrustation from the ancient artifact.
• Years of mineral deposits had created a thick incrustation on the cave walls.
• The incrustation process took decades to complete.
• She scraped away the incrustation to reveal the original surface underneath.