Dictionary![]() ![]() su•per•phos•phatePronunciation: (sOO"pur-fos'fāt), [key] —n. Chem. 1. Also called acid phosphate. a mixture of calcium acid phosphate and calcium sulfate prepared by treating phosphate rock with sulfuric acid: used chiefly as a fertilizer. 2. Also called triple superphosphate. a mixture prepared with phosphoric acid and containing about 45 percent of soluble phosphates, used as a fertilizer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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