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Definition of neptunium

The word neptunium uses 9 letters: e, i, m, n, n, p, t, u, u

neptunium is playable in:

Words With Friends19
Scrabble US13
Scrabble UK13

Meanings of neptunium

n. - A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.

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