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[soo-per-fos-feyt] /ˌsu pərˈfɒs feɪt/
noun, Chemistry
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.
Also called triple superphosphate. a mixture prepared with phosphoric acid and containing about 45 percent of soluble phosphates, used as a fertilizer.
Origin of superphosphate
1790-1800; super- + phosphate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for superphosphate
  • Only normal superphosphate, triple superphosphate, and ammonium phosphate are discussed in this background report.
  • Some ponds may be well served with only an occasional application of superphosphate.
  • Ammoniated superphosphates are produced by adding normal superphosphate or triple superphosphate to the mixture.
  • Sources of calcium are dolomitic lime, gypsum, and superphosphate.
British Dictionary definitions for superphosphate


a mixture of the diacid calcium salt of orthophosphoric acid Ca(H2PO4)2 with calcium sulphate and small quantities of other phosphates: used as a fertilizer
a salt of phosphoric acid formed by incompletely replacing its acidic hydrogen atoms; acid phosphate; hydrogen phosphate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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