any of several clear, white, or greenish water-soluble compounds of formulas varying in ratio from Na 2 O⋅3.75SiO 2 to 2Na 2 O⋅SiO 2 : used chiefly in dyeing, printing, and fireproofing textiles and in the manufacture of paper products and cement.
British Dictionary definitions for sodium silicate
Also called soluble glass. a substance having the general formula, Na2O.xSiO2, where x varies between 3 and 5, existing as an amorphous powder or present in a usually viscous aqueous solution See water glass (sense 1)
any sodium salt of orthosilicic acid or metasilicic acid