A radioactive chemical element, one of the rare-earth elements, obtained from fission of uranium or neutron bombardment of neodymium and used in phosphorescent paint, as a power source, X-ray source, etc.: symbol, Pm; at. no. 61
Webster's New World
- atomic number 61
Origin of Promethium
1945. From the name of the Greek god Prometheus, who stole the fire from Mount Olympus and brought it down to mankind.
From American Heritage Dictionary of the English Language, 5th Edition
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