a. Chem. Also 9 † tellurious. [f. TELLUR-IUM + -OUS; substituted for the more regularly-formed tellurious.] Characterized by or of the nature of tellurium; said of compounds containing a greater proportion of tellurium than those called telluric; as tellurous acid, H2TeO3; also formerly applied to tellurous oxide (= tellurium dioxide), TeO2.

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1842.  {see TELLURIC a.1].

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1849.  D. Campbell, Inorg. Chem., 307. It deposits anhydrous tellurous acid in octohedral crystals. Tellurous acid hydrated precipitates in white flocks, of a bitter metallic taste.

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1854.  J. Scoffern, in Orr’s Circ. Sc., Chem., 476. Two oxides of tellurium are known, tellurious acid Te O2, and telluric acid Te O3.

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1869.  Roscoe, Elem. Chem. (1871), 146. With water the dioxide forms tellurous acid.

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