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acid phosphate

noun, Chemistry
1.
superphosphate (def 1).

superphosphate

[soo-per-fos-feyt] /ˌsu pərˈfɒs feɪt/
noun, Chemistry
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.
Origin
1790-1800
1790-1800; super- + phosphate
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for acid-phosphate

superphosphate

/ˌsuːpəˈfɒsfeɪt/
noun
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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