a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
[ Syn: praseodymium , pr , atomic number 59 ]
a self-governing commonwealth associated with the United States occupying the island of Puerto Rico
[ Syn: puerto rico , porto rico , commonwealth of puerto rico , pr ]
a promotion intended to create goodwill for a person or institution
[ Syn: public relations , pr ]