Rhodium (noun)

1. A rare, hard, and durable silver-white metal of the platinum group, used in alloys, as a catalyst, and in electroplating.
2. A plating of rhodium on a metallic object, usually jewelry, to give it a high-gloss, white appearance.

Origin:

Early 19th century: from modern latin, from greek rhodon "rose" (because of its color).

Examples:

1. Rhodium is used as a coating on white gold jewelry to make it more durable and give it a white appearance.
2. The catalytic converter in the car is coated in rhodium to reduce emissions.
3. The rhodium plating on the watch will wear off over time and will need to be reapplied.
4. Rhodium is a very hard and durable metal that is resistant to tarnishing and corrosion.
5. Rhodium is a rare and expensive metal, making it valuable for industrial and decorative use.