a.1.(Chem.) Of, pertaining to, or designating, a thionic derivative, H2S4O6, of sulphuric acid, obtained as a colorless, odorless liquid.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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This is also caused by dilute fluoride and tetrathionic acid (H2S4O6) solutions at room temperature [96].