| superphosphate (def. 2). |
[soo-per-fos-feyt] 
| 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. |
pərˈfɒs