praseodymium(n = noun.substance) atomic number 59, pr - a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process; Array
An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6. [1913 Webster]
praseodymium, n. Chem. a soft silvery metallic element of the lanthanide series, occurring naturally in various minerals and used in catalyst mixtures.
Usage
Symb.: Pr.
Etymology
G Praseodym f. Gk prasios (see PRASE) from its green salts, + G Didym DIDYMIUM