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Meaning of ACTINIUM

Pronunciation:  ak'tineeum

 
WordNet Dictionary
 
 Definition: 
[n]  a radioactive element of the actinide series; found in uranium ores
 

ACTINIUM is a 8 letter word that starts with A.

 

 Synonyms: Ac, atomic number 89
 
 See Also: chemical element, element, uranium ore

 

 

Webster's 1913 Dictionary
 
 Definition: 
\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.

 

 

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