incrustation
in.crus.ta.tion \.in-.kr*s-'ta--sh*n\ n [L incrustation-, incrustatio, fr. incrustatus, pp. of inc]rustare to encrust 1: the act of encrusting or state of being encrusted 2a: a crust or hard coating 2b: something resembling a crust 3a: OVERLAY 3b: INLAY