Webster's English Dictionary

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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