orthosilicate
/ˌɔːθə(ʊ)ˈsɪlɪkət/ /ˌɔːθə(ʊ)ˈsɪlɪkeɪt/Chemistry
noun
A salt containing the anion SiO4 4−; the anion itself; a salt or ester of orthosilicic acid; any mineral or other compound containing discrete tetrahedral SiO4 anions.
Origin
Mid 19th century; earliest use found in William Odling (1829–1921), chemist. From ortho- + silicate.