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incrustation

noun [C]
 
 
/ˌɪn.krʌsˈteɪ.ʃən/ (US also encrustation)

Definition

a layer of material, such as dirt or a chemical, which forms on something, especially slowlyCoverings and layers
(Definition of incrustation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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