Sū′per-phōs′phate, n.

n. [Prefix super and phosphate, q. v.] (Chem.) A phosphate containing the greatest amount of phosphoric acid that can combine with the base.

Superphosphate of lime. (a.) (Com.) A fertilizer prepared by treating ground bones, bone-black, or phosphorite, with sulphuric acid, whereby a portion of the insoluble phosphoric acid is rendered soluble in water. (b.) (Chem.) A soluble salt, composed of one equivalent of phosphoric acid, one of lime, and ten of water. It is the characteristic ingredient of the commercial superphosphate of lime.