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francium (n.)

radioactive element, 1946, named by French physicist Marguerite Catherine Perey (1909-1975) who first identified it at the Curie Institute in Paris, from Latinized form of France. With metallic element ending -ium.

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Definitions of francium from WordNet

francium (n.)
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium;
Synonyms: Fr / atomic number "
From wordnet.princeton.edu