\Stan"nous\ (-n[u^]s), a. (Chem.)
Pertaining to, or containing, tin; specifically, designating
those compounds in which the element has a lower valence as
contrasted with {stannic} compounds.
{Stannous chloride} (Chem.), a white crystalline substance,
   {SnCl2.(H2O)2}, obtained by dissolving tin in hydrochloric
   acid. It is used as a mordant in dyeing.