su·per·phos·phate (s  p r-f s f t)n. 1. An acid phosphate. 2. A mixture of gypsum and monobasic calcium phosphate resulting from the action of sulfuric acid on phosphate rock, used as a fertilizer. |
superphosphate
Noun
a chemical fertilizer, esp. one made by treating rock phosphate with sulphuric acid
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