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superphosphate |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Superphosphate \Su`per*phos"phate\, n. (Chem.) An acid phosphate. {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.
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