Word:

Actinium

Ac`tin´i`um
n.1.(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.
Noun1.actinium - a radioactive element of the actinide series; found in uranium ores
Synonyms: Ac, atomic number 89
Ac, atomic number 89, chemical element, element, uranium ore
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Actinic
actinic dermatitis
actinic keratosis
actinic radiation
actinic ray
actinide
actinide series
Actinidia
Actinidia arguta
Actinidia chinensis
Actinidia deliciosa
Actinidia polygama
Actinidiaceae
Actiniform
Actiniopteris
Actinism
-- Actinium --
Actino-chemistry
Actinogram
Actinograph
Actinoid
Actinolite
Actinolitic
Actinology
Actinomere
Actinomeris
Actinomeris alternifolia
Actinometer
Actinometric
actinometrical
Actinometry
actinomorphic
actinomorphous
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