Bible Dictionaries
Neptunium
Webster's Dictionary
(n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
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Bibliography Information
Webster, Noah. Entry for 'Neptunium'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/n/neptunium.html. 1828.