1. having a hard outer layer or surface coating
2. dried and hardened on the surface

Examples

• The old paint was crusted and peeling off the walls.
• Her boots were crusted with dried mud from the hike.
• The bread had a perfectly crusted exterior.
• Snow crusted over during the cold night.
• The wound had crusted over and was healing well.
• The pie’s crusted top was golden brown.
• Salt crusted the edges of the tide pools.