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The Collaborative International Dictionary
Thallous

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.]

Wiktionary
thallous

a. (context inorganic chemistry English) Of or pertaining to thallium, especially to thallium having a valency of 1

Usage examples of "thallous".

On allowing the liquid to stand for some time a bright yellow precipitate of thallous iodide separates out.