Definition of Actinium

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

Exact synonyms: Ac, Atomic Number 89
Generic synonyms: Chemical Element, Element
Substance meronyms: Uranium Ore

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

actinically
actinide
actinide elements
actinide series
actinides
actinidic
actinidic acid
actinidin
actinidine
actiniferous
actiniform
actinin
actinins
actinism
actinisms
actinium (current term)
actiniums
actino-
actino-chemistry
actino-uranium
actinobacillosis
actinobacillus actinomycetemcomitans
actinobacillus infections
actinobacillus pleuropneumoniae
actinobacteria
actinobacteria group
actinobacterial
actinobacterium
actinobiology

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