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WordReference Random House Unabridged Dictionary of American English © 2024bort (bôrt),USA pronunciation n. - Mineralogylow-quality diamond, in granular aggregate or small fragments, valuable only in crushed or powdered form, esp. for industrial use as an abrasive.
Also, boart, bortz (bôrts).USA pronunciation Cf. ballas, carbonado2. - 1615–25; apparently metathetic variant of *brot (Old English gebrot fragment); akin to Middle English brotel brittle, Old Norse brot fragment
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