Answer: reguli

AnswerCrossword Clue
REGULIImpure metal formed beneath slag.
reguliREGULUS, a mass that forms beneath the slag in a furnace
regulia. the metallic mass that forms beneath the slag at the bottom of the crucible or furnace in smelting ores b. impure intermediate product obtained in smelting ores
regulifirst magnitude star in the constellation Leo