'Thallious' definitions:

Definition of 'Thallious'

From: GCIDE

Thallious \Thal"li*ous\, a. (Chem.) See Thallous. [1913 Webster]

Definition of 'thallious'

From: GCIDE

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.] [1913 Webster]

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