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thallous |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Thallous \Thal"lous\, a. (Chem.) Of or pertaining to thallium; derived from or containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the {thallic} compounds. [Written also {thallious}.]