molybdous

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

• adjective Relating to or containing molybdenum, especially with a valence less than 6.

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

• adjective Of, pertaining to, or containing, molybdenum; specif., designating those compounds in which molybdenum has a lower valence as contrasted with molybdic compounds.

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

• adjective chemistry Of, pertaining to, or containing molybdenum; specifically designating those compounds in which molybdenum has a lower valence as contrasted with molybdic compounds.