What is "calcium arsenate"

n. (context inorganic compound English) The inorganic salt Ca₃(AsO₄)₂ that is used as a pesticide and germicide

Calcium arsenate is the inorganic compound with the formula Ca(AsO). A colourless solid, it was originally used as a pesticide and as a germicide. It is highly soluble in water, as compared with lead arsenate, which makes it more toxic. The minerals Rauenthalite Ca(AsO)·10HO and Phaunouxite Ca(AsO)·11HO are hydrates of calcium arsenate.