STANNOUS
stannic, stannous
(adjective) of or relating to or containing tin
Source: WordNet® 3.1
Etymology
Adjective
stannous (not comparable)
(chemistry) Containing bivalent tin.
Source: Wiktionary
Stan"nous, a. (Chem.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition