ˈskōrēə, ˈskȯr- noun
( plural scori·ae -ēˌē)
Etymology: Middle English, from Latin, from Greek skōria, from skōr excrement + -ia -y — more at scat-
1.
a. : the refuse from melting of metals or reduction of ores : dross , slag
b. : a burned clay or clinker deposit characteristic of burned-out coal beds on the western Great Plains
2. : rough vesicular cindery usually dark lava developed by the expansion of the enclosed gases in basaltic magma ; also : a piece of such lava