sodium metasilicate
noun
sodium meta·sil·i·cate
-ˌme-tə-ˈsi-lə-ˌkāt
-ˈsi-li-kət
: a toxic corrosive crystalline salt Na2SiO3 used especially as a detergent or as a substitute for phosphates in detergent formulations
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Merriam-Webster unabridged
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