• Webster's Revised Unabridged Dictionary
    • n Metasilicate (Chem) A salt of metasilicic acid.
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Century Dictionary and Cyclopedia
    • n metasilicate A salt of the hypothetical metasilicic acid H2SiO3: often called in mineralogy a bisilicate: as, calcium metasilicate (the mineral wollastonite, CaSiO3 or CaO.SiO2).
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In literature:

It is a calcium-magnesium metasilicate, CaMg(SiO3)2, and crystallizes in the monoclinic system.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
P. Groth writes the formula as a metasilicate (AlO)2SiO3.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various