noun a new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
NEPTUNIUM
Meaning of NEPTUNIUM in English
Webster English vocab. Английский словарь Webster. 2012
noun a new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
Webster English vocab. Английский словарь Webster. 2012