What is "boron phosphate"

n. (context inorganic compound English) An inorganic polymer, of empirical formula BPO₄, used as a phosphor and a source of dietary boron.

Boron phosphate is an inorganic compound with the chemical formula BPO. The simplest way of producing it is the reaction of phosphoric acid and boric acid. It is a white infusible solid that evaporates above 1450 °C.