incrustation

英 [,ɪnkrʌs'teɪʃən] 美[,ɪnkrʌ'steʃən]

• n. 硬壳；镶嵌物；水锈；痂（等于encrustation）

1. the formation of a crust

2. a hard outer layer that covers something

3. a decorative coating of contrasting material that is applied to a surface as an inlay or overlay