a salt or ester derived from silica or a silicic acid
See silicate in American Heritage Dictionary 4
noun
Any of numerous compounds containing silicon, oxygen, and one or more metals; a salt of silicic acid.
Any of a large group of minerals, forming over 90 percent of the earth's crust, that consist of SiO2 or SiO4 groupings combined with one or more metals and sometimes hydrogen.