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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
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.