Dictionary
pra•se•o•dym•i•um
Pronunciation: (prā"zē-ō-dim'ē-um, prā"sē-), [key]—
n. Chem.
a rare-earth, metallic, trivalent element, named from its green salts.
Symbol: Pr;
at. wt.: 140.91;
at. no.: 59;
sp. gr.: 6.77 at 20°C.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.