Plutonium Definition

plo͝o-tōnē-əm
noun
A radioactive, metallic chemical element, one of the actinides, found in trace quantities in native uranium ores and produced by bombarding uranium with deuterons: symbol, Pu; at. no. 94: its most important isotope (plutonium-239) is used in nuclear weapons and as a reactor fuel.
Webster's New World
Synonyms:
  • atomic number 94
  • pu

Origin of Plutonium

  • After the dwarf planet Pluto (from the fact that it follows neptunium in the periodic table)

    From American Heritage Dictionary of the English Language, 5th Edition

  • After Pluto (the entity formerly considered to be a planet).

    From Wiktionary

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