Definitions
Soft rare-earth element used in lenses, batteries, and alloys.
Word origin
From Ancient Greek λανθάνω (lanthánō, “to escape notice”) + -um (“a chemical element”), because it had gone long undetected in mineral ores.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Camera-lens element”9 letters
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