D defs.my
Entry 1 sense Webster, 1913

Stannous

/(-nŭs)/ · Stan·nous · IPA /ˈstænəs/
01 a. Pertaining to, or containing, tin; specifically, designating those compounds in which the element has a lower valence as contrasted with st…
  1. 1.
    Pertaining to, or containing, tin; specifically, designating those compounds in which the element has a lower valence as contrasted with stannic compounds.(Chem.)
Phrases & compounds
Stannous chloride — a white crystalline substance, SnCl2.(H2O)2, obtained by dissolving tin in hydrochloric acid. It is used as a mordant in dyeing.