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(ə-găn′ə-sŏn′, ô′gə-nĕs′ŏn, -ən)
n. Symbol Og
An artificially produced radioactive element with atomic number 118, whose most stable isotope has a mass number of 294 and a half-life of 1.3 milliseconds.

[oganess- (after Yuri Oganessian (born 1933), Russian nuclear physicist and scientific director at the Joint Institute for Nuclear Research in Dubna, where the element was first synthesized) + -on.]
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References in periodicals archive ?
Oganesson, meanwhile, was named for Russian scientist Yuri Oganessian, who, along with his team, discovered the heaviest of all known elements.
The four elements confirmed by the International Union of Pure and Applied Chemistry are Nihonium (Nh), Moscovium (Mc), Tennessine (Ts) and Oganesson (Og).
Element 118 will be named oganesson, or Og, after Yuri Oganessian, a Russian physicist who contributed to the discovery of several superheavy elements.