GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Scoria , n.; pl. Scoriae . [L., fr. Gr. , fr.  dung, ordure.]
   The recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross.
   1913 Webster
   Cellular slaggy lava; volcanic cinders.
   1913 Webster