adjective Chemistry.
containing univalent thallium.
Also, thallious [thal-ee-uhs] .

1885–90; thall(ium) + -ous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thallous (ˈθæləs)
of or containing thallium, esp in the monovalent state

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The thallous state is the more common and stable form.
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