Nebulium was a proposed element found in a nebula by William Huggins in 1864. The strong green emission lines of the Cat`s Eye Nebula, discovered using spectroscopy, led to the postulation that an as yet unknown element was responsible for this emission. In 1927, Ira Sprague Bowen showed that the lines are emitted by doubly ionized oxygen (O2+), ....
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http://en.wikipedia.org/wiki/Nebulium
hypothetical chemical element whose existence was suggested in 1868 by the English astronomer Sir William Huggins as one possible explanation for ...
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http://www.britannica.com/eb/a-z/n/21
nebulium Name of an unidentified chemical element.
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http://www.wordinfo.info/words/index/info/view_unit/1376/
a hypothetical element once thought to be present in emission nebulae because of certain unidentified spectral lines, now known to be forbidden transitions of oxygen and nitrogen ions.
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https://www.infoplease.com/dictionary/nebulium
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