1. hard layers or coatings that form on surfaces, especially through the buildup of mineral deposits or other substances

Examples

• The old pipes were clogged with calcium incrustations.
• Salt incrustations covered the rocks near the shore.
• The archaeologist carefully removed the incrustations from the ancient artifact.
• Years of mineral deposits had formed thick incrustations on the cave walls.
• The ship’s hull showed heavy incrustations of barnacles and seaweed.
• Lime incrustations made the faucet difficult to turn.