Word.ws English Dictionary

lanthanium

lanthanium is the alternative form of lanthanum.

Meaning of lanthanum

Noun

lanthanum (countable and uncountable, plural lanthanums)

  1. (uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
  2. (countable) An atom of this element.

Forms of lanthanium

plurallanthaniums

Origin of lanthanium

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

Words formed from lanthanium

Questions about lanthanium

What is lanthanium the alternative form of?
Lanthanium is the alternative form of lanthanum.

Words near lanthanium in the dictionary

  1. lanthanide contraction
  2. lanthanide contractions
  3. lanthanides
  4. lanthanite
  5. lanthanites
  6. lanthanium
  7. lanthanoid
  8. lanthanoids
  9. lanthanosuchid
  10. lanthanosuchids
  11. lanthanosuchoid

Source and license

Adapted from Wiktionary: lanthanium (page history and authors); lanthanum (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “lanthanium.” Word.ws, https://word.ws/lanthanium. Based on Wiktionary, CC BY-SA 4.0.