Pen′ta‐thi‐on″ic (?), a. [Penta- + thionic.] (Chem.) Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; — so called because it contains five atoms of sulphur.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.