Dictionarybo'rax pentahy'drateChem. a white, crystalline, water-soluble solid, Na2B4O7·5H2O, used chiefly for killing weeds, as a water softener, and as a disinfectant and deodorizing agent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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