What is "tetrahydroxyborate"

n. (context inorganic chemistry English) The anion B(OH)₄^- obtained by the reaction of hydroxide with boric acid; any salt containing this ion

Tetrahydroxyborate (systematically named tetrahydroxyboranuide and tetrahydroxidoborate(1−)) is an inorganic anion with the chemical formula (also written as or ). It contributes no colour to tetrahydroxyborate salts. It is found in the mineral hexahydroborite, Ca(B(OH))·2HO (originally formulated CaBO.6HO). It is classified as a weak base.