Wa″si‐um (?), n. [NL. So called from Wasa, or Vasa, the name of a former royal family of Sweden.] (Chem.) A rare element supposed by Bahr to have been extracted from wasite, but now identified with thorium.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.