# unununium

> English word · Noun

## Definitions
1. roentgenium.

## Etymology
Systematic element name, from un- + un- + un- + -ium.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/unununium