- a mixture of calcium acid phosphate and calcium sulfate prepared by treating phosphate rock with sulfuric acid: used chiefly as a fertilizer.
- a mixture prepared with phosphoric acid and containing about 45 percent of soluble phosphates, used as a fertilizer.
- a mixture of the diacid calcium salt of orthophosphoric acid Ca(H 2 PO 4) 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
