metaborate
/mɛtəˈbɔːreɪt/Chemistry
noun
Any of a class of borates that are relatively less hydrated than the orthoborates; (equivalently) any borate containing the anion BO2 −; the anion itself; a polyanion with this general formula, especially B3O6 3−.
Origin
Mid 19th century; earliest use found in Henry Watts (1815–1884), chemist. From meta- + borate.