metasilicicadj.
/ˌmɛtəsᵻˈlɪsɪk/, U.S. /ˈˌmɛdəsəˈlɪsɪk/ Chemistry.
metasilicic acid n. an oxoacid of silicon obtained by partial dehydration of orthosilicic acid and having the general formula H2SiO3, now believed not to exist in a monomeric state but to contain long-chain polyanions.
ΚΠ
1879 H. Watts Dict. Chem. (new ed.) VI. 825 Metasilicic Acid, see silica.
1889 Amer. Jrnl. Sci. 138 154 Professor P. Groth..points out that polysilicic acid may be regarded as compounded of disilicic and metasilicic acids.
1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 32 Metasilicic acid SiO2.H2O and orthosilicic acid SiO2.2H2O can be obtained under certain conditions of drying.
1938 R. Hum Chem. for Engin. Students xxv. 687 Metasilicic acid, H2SiO3 (H4SiO4 − H2O or SiO2.H2O) gives sodium metasilicate, [etc.].
1973 E. G. Rochow in J. C. Bailar et al. Comprehensive Inorg. Chem. xv. 1411 Metasilicic acid, H2SiO3 or SiO2·H2O,..has a solubility of 10×10−4 moles per litre of water at 20°.
1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) ix. 280 There is actually neither metasilicic acid not [sic] any discrete metasilicate anion. With the exception of the few ‘metasilicates’ with cyclic anions, such compounds contain infinite chain anions.
1992 Dict. Inorg. Compounds III. 3362/2 Silicic acid... Metasilicic acid..H2SiO3..Synth. by partial dehydration of H4SiO4 with aq. H2SO4 or Me2CO.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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adj.1879