encrustation

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en·crus·ta·tion / ˌenkrəsˈtāshən/ (also in·crus·ta·tion) • n. the action of encrusting or state of being encrusted. ∎  a crust or hard coating on the surface of something: the sides are white with encrustations of salt. ∎  an outer layer or crust of ornamentation. ∎  Archit. a facing of marble on a building.