Source : Webster's Revised Unabridged Dictionary (1913)

Plumbous \Plum"bous\, a. [From {Plumbum}.] (Chem.)
   Of, pertaining to, or containing, lead; -- used specifically
   to designate those compounds in which it has a lower valence
   as contrasted with plumbic compounds.

Source : WordNet®

plumbous
     adj : relating to or consisting of lead [syn: {plumbic}]