noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The unstable, radioactive, chemical element with atomic number 118, now named oganesson. dated, uncountable

Synonyms

All synonyms

oganessonununoctium

Etymology

From eka- + radon.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.