basic slag

noun Metallurgy.

slag formed by the basic process of steelmaking, used as a furnace or converter lining or as a fertilizer.

Origin:
1885–90

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World English Dictionary

basic slag

—n
	a furnace slag produced in steel-making, containing large amounts of calcium phosphate: used as a fertilizer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Basic slag is always a great word to know.

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the offspring of a zebra and a donkey.

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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