# untriennium

> English word · Noun

## Definitions
1. The systematic element name for the chemical element with atomic number 139 (symbol Ute).

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

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