Etymology
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xenon (n.)

gaseous element, 1898, from Greek xenon, neuter of xenos "foreign, strange" (from PIE root *ghos-ti- "stranger, guest, host"); coined by its co-discoverer, Scottish chemist Sir William Ramsay (1852-1916); compare krypton.

updated on May 30, 2017

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Definitions of xenon from WordNet

xenon (n.)
a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts;
Synonyms: Xe / atomic number "
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.