DictionaryRoot: corium
Latin
corium
hide, skin
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noun
excoriation
ik-skor-ee-AY-shun/ɪkˌskɔːriˈeɪʃn/
Scraping away or damaging the skin.
Etymology
The pieces describe stripping skin off, the literal basis of excoriation as skin damage. The figurative meaning turns that flaying into severe verbal criticism.