Usually means: Synthetic, radioactive element, atomic number 118.
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We found 3 dictionaries that define the word oganesson:

General (3 matching dictionaries)
  1. oganesson: Merriam-Webster
  2. oganesson: Wiktionary
  3. Oganesson: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (oganesson)

noun:  The chemical element (Symbol Og) with atomic number 118. It is the heaviest known element. Highly radioactive, it does not occur naturally. Originally expected to be a noble gas, it is now predicted to be a reactive metallic solid, and a semiconductor or a post-transition metal.

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