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A Writer's Dictionary:

radium Definition


Dictionary Home » Words Starting with R » radiographic ... rail » radium


radium
noun
    1. chem.
      (symbol Ra, atomic number 88) a silvery-white highly toxic radioactive metallic element, discovered by Marie (1867―1934) and Pierre (1859―1906) Curie in 1898, obtained from uranium ores, especially pitchblende, and remarkable for its active spontaneous disintegration.
Etymology: 19c: from Latin radius ray.



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