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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