lithium
/ˈlɪθiəm/
noun
- A soft, silver-white metal that is the lightest of all metals. It is used in batteries, medicines, and special glasses.
- Most modern smartphones use lithium-ion batteries to store power.
- Lithium is an important element for making lightweight alloys used in airplanes.
- Doctors sometimes prescribe lithium to help people with certain mood disorders.