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also encrustation, 1640s, from Late Latin incrustationem (nominative incrustatio) "a covering with crust," noun of action from past participle stem of incrustare.
incrustation in·crust·a·tion (ĭn'krŭ-stā'shən)
The formation of a crust or a scab.
A coating of hardened exudate or other material on a body or body part.