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Definition of Orthosilicate
1. Noun. (chemistry) any salt or ester of orthosilicic acid, (M+)4SiO44− or Si(OR)4 ¹
2. Noun. (minerology) any silicate mineral, such as garnet or olivine, in which the SiO4 tetrahedra do not share oxygen atoms with each other ¹
¹ Source: wiktionary.com