atomic number 89

Noun
  1. A radioactive element of the actinide series;
    Found in uranium ores (synset 114651833)
    is a type of: chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    substance meronym: uranium ore - any ore from which uranium can be extracted
    same as: ac, actinium

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