1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Superphosphate \Su`per*phos"phate\, n. (Chem.) An acid phosphate. [1913 Webster] {Superphosphate of lime} (Com. Chem.), a fertilizer obtained by trating bone dust, bone black, or phosphorite with sulphuric acid, whereby the insoluble neutral calcium phosphate, {Ca3(PO4)2}, is changed to the primary or acid calcium phosphate {Ca(H2PO4)2}, which is soluble and therefore available for the soil. [1913 Webster]
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