The Collaborative International Dictionary
Tellurous
Tellurous \Tel"lu*rous\, a. (Chem.) Of or pertaining to tellurium; derived from, or containing, tellurium; specifically, designating those compounds in which the element has a lower valence as contrasted with telluric compounds; as, tellurous acid, which is analogous to sulphurous acid.
Wiktionary
tellurous
a. (context chemistry English) Containing tellurium in a higher valency than in telluric compounds. alt. (context chemistry English) Containing tellurium in a higher valency than in telluric compounds.