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.

1790–1800; super- + phosphate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superphosphate (ˌsuːpəˈfɒsfeɪt)
1.  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
2.  a salt of phosphoric acid formed by incompletely replacing its acidic hydrogen atoms; acid phosphate; hydrogen phosphate

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Example sentences
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.
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