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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Basic slag. A by-product from the manufacture of steel by the basic process, used as a fertilizer. It is rich in lime and contains 14 to 20 per cent of phosphoric acid. Called also Thomas slag, phosphatic slag, and odorless phosphate.
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From: WordNet (r) 2.0

 basic slag
      n : slag produced in making steel; low in silica but having
          large amounts of calcium phosphate; useful as fertilizer