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.

See also: Superphosphate

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The next stage is to sprinkle superphosphate of lime on the dug out soil either side of the trench at a rate of approximately two ounces per square yard.