noun, feminine/ˈkostɾa/plural: costras
crust; scab; snot
Synonyms: postilla, moco
Inherited from Latin crusta (following metathesis), from Proto-Indo-European *krustós (“hardened”), from *krews- (“to form a crust, begin to freeze”). Cognate with English crust. Also, compare English custard, an English descendant of Latin crusta that also underwent similar metathesis.