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Noun: actinium  ak'ti-nee-um
  1. A radioactive element of the actinide series; found in uranium ores
    - Ac, atomic number 89

Derived forms: actiniums

Type of: chemical element, element

Part of: uranium ore

Encyclopedia: Actinium

Nearest

actinide
actinide series
Actinidia
Actinidia arguta
Actinidia chinensis
Actinidia deliciosa
Actinidia polygama
Actinidiaceae
Actiniopteris
actinism
actinium
actinoid
actinolite
Actinomeris
Actinomeris alternifolia
actinometer
actinometric
actinometrical
actinometry
actinomorphic
actinomorphous