lithium
/ˈlɪθɪəm/noun
mass noun
1- the chemical element of atomic number 3, a soft silver-white metal. It is the lightest of the alkali metals. (Symbol: Li)（化学元素）锂（符号：Li）。
1.1
- lithium carbonate or another lithium salt, used as a mood-stabilizing drug碳酸锂, 锂盐。
词源
early 19th cent.: from lithia + -IUM.