n. 铁渣, 矿渣, 火山渣

[ noun ]
the scum formed by oxidation at the surface of molten metals
<noun.substance>

Scoria \Sco"ri*a\, n.; pl. {Scori[ae]}. [L., fr. Gr. ?, fr. ?
dung, ordure.]
1. The recrement of metals in fusion, or the slag rejected
after the reduction of metallic ores; dross.

2. Cellular slaggy lava; volcanic cinders.