WordReference Random House Unabridged Dictionary of American English © 2024su•per•phos•phate (so̅o̅′pər fos′fāt),USA pronunciation n. [Chem.]- ChemistryAlso 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.
- ChemistryAlso called triple superphosphate. a mixture prepared with phosphoric acid and containing about 45 percent of soluble phosphates, used as a fertilizer.
- super- + phosphate 1790–1800
Collins Concise English Dictionary © HarperCollins Publishers::
superphosphate /ˌsuːpəˈfɒsfeɪt/ n - 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