scoria Meaning, Definition & Usage
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noun the scum formed by oxidation at the surface of molten metals
slag; dross.
WordNet
Sco"ri*a noun
Etymology
L., fr. Gr. , fr. dung, ordure.Wordforms
Definitions
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The recrement of metals in fusion, or the slag rejected after the eduction of metallic ores; dross. -
Cellular slaggy lava; volcanic cinders.