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praseodymium    
n. 镨



praseodymium
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 [synonym: {praseodymium},
{Pr}, {atomic number 59}]

Praseodymium \Pra`se*o*dym"i*um\, n. [Praseo- didymium.]
(Chem.)
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]


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