metaboraten.
/mɛtəˈbɔːreɪt/, U.S. /ˌmɛdəˈbɔˌreɪt/ Chemistry.
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, esp.B3O63−.
ΚΠ
1863 H. Watts Dict. Chem. I. 639 Nearly all borates may be arranged in two classes, orthoborates and metaborates (so called from their analogy with the ortho- and metaphosphates and silicates).
1874 Jrnl. Chem. Soc. 27 1134 On fusing the metaborate with molecules of sodium hydrate.
1938 R. Hum Chem. for Engin. Students xxvii. 763 Borates of importance are either pyroborates or metaborates.
1950 N. V. Sidgwick Chem. Elements I. 384 The metaborates are of two types, both with the boron atom attached symmetrically to three oxygens in a plane with it... In calcium metaborate Ca(BO2)2 these groups form endless chains; in potassium metaborate KBO2 they are joined in threes to give B3O3 rings.
1962 Ecol. Monogr. 32 11 Similarly, with the application of sodium and calcium metaborates..,seedlings germinated and developed from 2 to 3 yrs after application of the herbicide, presumably after it had leached from the surface layers of soil.
1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) vi. 170 Anions that do not have BO4 groups, such as metaborate (B3O63−).., hydrate rapidly and lose their original structures.
1992 Dict. Inorg. Compounds I. 161/2 Metaborate (1−)... Usually found as a linear chain polyanion with B—O—B bonds.., but. v. rarely occurs as a linear [O=B—O]− species.
1998 Dental Materials 14 375 In that region, three intermingled zones of chainlike metaborate and pyroborate, of boroxol rings, and of a mixture of borate and silicate tetrahedra were identified.
This is a new entry (OED Third Edition, December 2001; most recently modified version published online March 2022).
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n.1863