costra

== Spanish == === Etymology === 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. === Pronunciation === IPA(key): /ˈkostɾa/ [ˈkos.t̪ɾa] Rhymes: -ostɾa Syllabification: cos‧tra === Noun === costra f (plural costras) crust scab Synonym: postilla snot Synonym: moco ==== Related terms ==== === Further reading === “costra”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025