Lithium (noun)

1. A soft, silver-white metal that is the lightest of all metals and is highly reactive.
2. A chemical element with the symbol Li and atomic number 3.
3. A drug that is used to treat some mental illnesses, such as bipolar disorder.

Origin:

Derived from the greek word "lithos" meaning "stone" as it was first discovered in 1817 in a mineral sample called petalite.

Examples:

1. Lithium is used in batteries for electric vehicles.
2. The element lithium is a light, silvery-white metal.
3. Lithium is a commonly prescribed medication for bipolar disorder.
4. The new alloy contains aluminum and lithium.
5. Lithium is a key component in the production of ceramics and glass.