escoria
/esˈkoɾja/ · B2 · noun · f
slag
🌋🪨 Same root as English scoria: the leftover rock and slag from fire
From Latin scoria, from Greek skōria, built on skōr, meaning dung. Literally it is the waste left after smelting. By extension it also means the scum of society, as in la escoria de la sociedad.