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actinidia polygama | actinidiaceae | actiniform | actiniopteris | actinism | actinium | actino-chemistry | actinogram | actinograph | actinoid | actinolite

actinium

 : 
Noun
 : 
ac=tin=i=um

CIDE DICTIONARY

actiniumn. [Gr. , , ray.].
     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]

OXFORD DICTIONARY

actinium, n. Chem. a radioactive metallic element of the actinide series, occurring naturally in pitchblende.

Usage
Symb.: Ac.

For further exploring for "actinium" in Webster Dictionary Online


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