Po‐lo″ni‐um (?), n. [NL. So named after Poland, in L. form Polonia, one of the discoverers being a Pole.] (Chem.) A supposed new element, a radioactive substance discovered by M. and MMe. Curie in pitchblende. It is closely related chemically to bismuth. It emits only alpha rays and is perhaps identical with radium F.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.