lanthanium

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

lanthanium (countable and uncountable, plural lanthaniums)

1. (UK) Alternative form of lanthanum.

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• Hyphenation: lan‧tha‧ni‧um

lanthanium n (uncountable)

1. lanthanum; alternative form of lanthaan