1. (

• praseodymium ,
• Pr ,
• atomic_number_ ,

) a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process ;

2. (

• Puerto_Rico ,
• Porto_Rico ,
• Commonwealth_of_Puerto_Rico ,
• PR

) a self-governing commonwealth associated with the United States occupying the island of Puerto Rico ;

3. (

• public_relations ,
• PR

) a promotion intended to create goodwill for a person or institution ;