1. 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]
WordNet (r) 3.0 (2006):
atomic number 59
n 1: 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]