1. (noun)tin, Sn, atomic number 50 a silvery malleable metallicelement that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide
2. (noun)tin a vessel (box, can, pan, etc.) made of tinplate and used mainly in baking
3. (noun)canister, cannister, tin metalcontainer for storing dry foods such as tea or flour