Cobalt (noun)

A chemical element with the symbol Co and atomic number 27. It is a hard, lustrous, silver-gray metal that is often used in alloys, pigments and catalysts.

Origin:

From german, meaning "goblin" or "evil spirit".

Examples:

1. The blue color of the glass is due to the addition of cobalt.
2. The cobalt drill bit is harder and more durable than regular steel bits.
3. Cobalt is used in the production of jet engine parts.
4. The cobalt salts are used to make pigments for ceramics and glass.
5. Cobalt is used in lithium-ion batteries to increase their energy density.