Graphite (noun)

A naturally occurring form of carbon with a metallic luster, used as a lubricant and in pencils and other types of writing and drawing instruments.

Origin:

From the greek word graphein, meaning "to write".

Examples:

1. He sharpened his pencil with a pencil sharpener, revealing the graphite core.
2. Graphite is used as a lubricant in high temperature and high pressure applications.
3. The artist use graphite pencils to create the drawing.
4. Graphite is a good conductor of electricity.
5. Graphite is a mineral that is used as a lubricant and as a material in batteries and solar panels.