triple superphosphate


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 of superphosphate

First recorded in 1790–1800; super- + phosphate Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for triple-superphosphate


  1. 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
  2. a salt of phosphoric acid formed by incompletely replacing its acidic hydrogen atoms; acid phosphate; hydrogen phosphate
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