Praseodymium

[prey-zee-oh-dim-ee-uh m, prey-see-] /ˌpreɪ zi oʊˈdɪm i əm, ˌpreɪ si-/
noun, Chemistry.
1.
a rare-earth, metallic, trivalent element, named from its green salts. Symbol: Pr; atomic weight: 140.91; atomic number: 59; specific gravity: 6.77 at 20°C.
praseodymium
/ˌpreɪzɪəʊˈdɪmɪəm/
noun
1.
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: 140.90765; valency: 3; relative density: 6.773; melting pt: 931°C; boiling pt: 3520°C

praseodymium pra·se·o·dym·i·um (prā’zē-ō-dĭm’ē-əm, prā’sē-)
n.
Symbol Pr
A soft malleable ductile rare-earth element that develops a characteristic green tarnish in air and is used to color glass and ceramics yellow and in metallic alloy. Atomic number 59; atomic weight 140.908; melting point 931°C; boiling point 3,510°C; specific gravity 6.8; valence 3.
praseodymium
(prā’zē-ō-dĭm’ē-əm)
Symbol Pr
A soft, malleable, silvery metallic element of the lanthanide series that develops a green tarnish in air. It is used to add a yellow tint to glass and ceramics and to make the glass used in welding goggles. Atomic number 59; atomic weight 140.908; melting point 935°C; boiling point 3,127°C; specific gravity 6.8; valence 3, 4. See Periodic Table.