1. a rare silvery-white metallic chemical element used in jewelry, electronics, and catalytic converters
Usage: chemistry
2. something that provides protection or safety; a safeguard
Usage: formal

Examples

• Palladium is more expensive than gold due to its rarity.
• The catalytic converter contains platinum and palladium.
• Her wedding ring was made of palladium instead of traditional gold.
• The constitution serves as a palladium of our civil liberties.
• Education is often called the palladium of democracy.
• The new security system acts as a palladium against cyber attacks.