U′ni‐sil″i‐cate (?), n. [Uni- + silicate.] (Min.) A salt of orthosilicic acid, H4SiO4; — so called because the ratio of the oxygen atoms united to the basic metals and silicon respectively is 1:1; for example, Mg2SiO4 or 2MgO.SiO2.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.