tellurous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or derived from tellurium, especially with valence 4.

from The Century Dictionary.

• Of, pertaining to, or obtained from tellurium.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry Containing tellurium in a higher valency than in telluric compounds.