# lanthanium

> English word · Noun

## Definitions
1. Alternative form of lanthanum.

## Etymology
From Ancient Greek λανθάνω (lanthánō, “to escape notice”), because it had gone long undetected in mineral ores; + -ium (“a chemical element”).

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