oga·​nes·​son ˌō-gə-ˈne-ˌsän How to pronounce oganesson (audio)
: a short-lived, artificially produced radioactive element that has 118 protons
symbol Og
see Chemical Elements Table

Examples of oganesson in a Sentence

Recent Examples on the Web Oganessian is the namesake for oganesson, element 118, discovered in 2004 by his team at JINR and currently the heaviest ever made. Daniel Clery, Science | AAAS, 12 Feb. 2021 Before an element is officially named, its placeholder name is based on the Latin names for its atomic number: oganesson, number 118, was known as ununoctium (one-one-eight-ium). Bill Andrews, Discover Magazine, 26 June 2019

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'oganesson.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Yuri Tsolakovich Oganessian born 1933 Russian-Armenian physicist (Russian Jurij Colakovič Oganesjan, Armenian Yuri Cʼolaki Hovhannisyan) + -on, suffix of elements that are noble gases, as argon and xenon

First Known Use

2016, in the meaning defined above

Time Traveler
The first known use of oganesson was in 2016

Dictionary Entries Near oganesson

Cite this Entry

“Oganesson.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oganesson. Accessed 23 Apr. 2024.

Kids Definition


oga·​nes·​son ˌō-gə-ˈne-ˌsän How to pronounce oganesson (audio)
: a short-lived artificially produced radioactive element see Chemical Elements Table
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!