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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Silicate \Sil"i*cate\, noun[Cf. F. silicate.] (Chem.) A salt of silicic acid.
Note: In mineralogical chemistry the silicates include; the unisilicates or orthosilicates, salts of orthosilicic acid; the bisilicates or metasilicates, salts of metasilicic acid; the polysilicates or acid silicates, salts of the polysilicic acids; the basic silicates or subsilicates, in which the equivalent of base is greater than would be required to neutralize the acid; and the hydrous silicates, including the zeolites and many hydrated decomposition products.
From WordNet (r) 2.0 [wn]:
silicate
noun: a salt or ester derived from silicic acid
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