Real Dictionary

praseodymium in American English
a silvery, malleable chemical element, one of the rare-earth elements, whose salts are generally green in color and are used to color glasses and enamels: symbol, Pr; at. no., 59
noun: a rare-earth, metallic, trivalent element, named from its green salts; at. wt.: 140.91; at. no.: 59; sp. gr.: 6.77 at 20°C

praseodymium in British English
noun: a malleable ductile silvery-white element of the lanthanide series of metals. It occurs principally in monazite and bastnaesite and is used with other rare earths in carbon-arc lights and as a pigment in glass. Symbol: Pr; atomic no: 59; atomic wt: 140.90