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actinium    
n. 锕

锕

actinium
n 1: a radioactive element of the actinide series; found in
uranium ores [synonym: {actinium}, {Ac}, {atomic number 89}]

Actinium \Ac*tin"i*um\, n. [Gr. ?, ?, ray.] (Chem.)
A supposed metal, said by Phipson to be contained in
commercial zinc; -- so called because certain of its
compounds are darkened by exposure to light.
[1913 Webster]


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