Lexic.us

Definition of Actinium

1. Noun. A radioactive element of the actinide series; found in uranium ores.

Definition of Actinium

1. n. 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.

Definition of Actinium

1. Noun. a radioactive, metallic chemical element (''symbol'': Ac) with an atomic number of 89; found in uranium ores ¹

¹ Source: wiktionary.com

Definition of Actinium

1. a radioactive element [n -S]

Medical Definition of Actinium

1. 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. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Actinium

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