Xenon

['zenɒn;'ziː-] or ['zinɑn]

(noun.) a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts.

Edited by Bernice--From WordNet

Discovery of Neon and Metargon by Ramsey and Travers; Coronium by Nasini; Xenon by Ramsey; Monium by Crookes, and Etherion by Brush. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.

Checker: Lyman