triple-superphosphate

triple superphosphate

noun
superphosphate ( def 2 ).
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superphosphate

[soo-per-fos-feyt]
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; super- + phosphate

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World English Dictionary
superphosphate (ˌsuːpəˈfɒsfeɪt)
 
n
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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