Main Entry: sco·ria

Pronunciation: \ˈskȯr-ē-ə\

Function: noun

Inflected Form(s): plural sco·ri·ae \-ē-ˌē, -ē-ˌī\

Etymology: Middle English, from Latin, from Greek skōria, from skōr excrement — more at scatology

Date: 14th century

1 : the refuse from melting of metals or reduction of ores : slag
2 : rough vesicular cindery lava

— sco·ri·a·ceous \ˌskȯr-ē-ˈā-shəs\ adjective