Standard Lemma guide

lanthanum

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • lăn'thənəm
  • /ˈlænθənəm/
  • US: Recorded audio is listed in the source snapshot.
  • General-American: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: L AE1 N TH AH0 N AH0 M Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

An atom of this element.

Definition source: English Wiktionary via Wiktextract

Usage: countable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: La, atomic number 57

Antonyms: none provided

Broader terms: metallic element, metal

History

Etymology

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

Across languages

Translations

77 source translations are retained for this English entry.

  • Afrikaans: lantaan — metallic element
  • Albanian: lantan — metallic element
  • Arabic: لَانْثَانُوم (lānṯānūm) — metallic element
  • Arabic: لَانْتَانُوم (lāntānūm) — metallic element
  • Arabic: لَنْثَنُوم (lanṯanūm) — metallic element
  • Arabic: لَنْتَنُوم (lantanūm) — metallic element
  • Armenian: լանթան (lantʻan) — metallic element
  • Asturian: lantanu — metallic element
  • Basque: lantanoa — metallic element
  • Belarusian: ланта́н (lantán) — metallic element
  • Breton: lantan — metallic element
  • Bulgarian: ланта́н (lantán) — metallic element
  • Catalan: lantani — metallic element
  • Chinese Mandarin: 鑭 /镧 (làn) — metallic element
  • Cornish: lanthanum — metallic element
  • Czech: lanthan — metallic element
  • Danish: lanthan — metallic element
  • Dutch: lanthaan — metallic element
  • Dutch: lanthanium — metallic element
  • Esperanto: lantano — metallic element
  • Estonian: lantaan — metallic element
  • Faroese: lantan — metallic element
  • Finnish: lantaani — metallic element
  • French: lanthane — metallic element
  • West-Frisian: lanthaan — metallic element
  • Friulian: lantani — metallic element
  • Galician: lantano — metallic element
  • Georgian: ლანთანი (lantani) — metallic element
  • German: Lanthan — metallic element
  • Greek: λανθάνιο (lanthánio) — metallic element
  • Hebrew: לנתן (lantán) — metallic element
  • Hindi: सुजारला (sujārlā) — metallic element
  • Hungarian: lantán — metallic element
  • Icelandic: lanþan — metallic element
  • Ido: lantano — metallic element
  • Irish: lantainam — metallic element
  • Italian: lantanio — metallic element
  • Japanese: ランタン (rantan) — metallic element
  • Kashubian: lantón — metallic element
  • Kazakh: лантан (lantan) — metallic element
  • Khmer: ឡង់តាន (lɑngtaan) — metallic element
  • Korean: 란탄 (rantan) — metallic element
  • Korean: 란타늄 (rantanyum) — metallic element
  • Korean: 란타넘 (rantaneom) — metallic element
  • Latin: lanthanum — metallic element
  • Latvian: lantāns — metallic element
  • Lithuanian: lantanas — metallic element
  • Luxembourgish: Lanthan — metallic element
  • Macedonian: ланта́н (lantán) — metallic element
  • Malay: lantanum — metallic element
  • Maltese: lantanum — metallic element
  • Manx: lantanum — metallic element
  • Mongolian: лантан (lantan) — metallic element
  • Norwegian: lantan — metallic element
  • Occitan: lantani — metallic element
  • Polish: lantan — metallic element
  • Portuguese: lantânio — metallic element
  • Romanian: lantan — metallic element
  • Russian: ланта́н (lantán) — metallic element
  • Scottish Gaelic: lantanam — metallic element
  • Serbo-Croatian: лантан — metallic element
  • Serbo-Croatian: lantan — metallic element
  • Slovak: lantán — metallic element
  • Slovene: lantan — metallic element
  • Spanish: lantano — metallic element
  • Swedish: lantan — metallic element
  • Tagalog: lantano — metallic element
  • Tajik: lantan — metallic element
  • Tamil: மாய்மம் (māymam) — metallic element
  • Thai: แลนทานัม (lɛɛn-taa-nâm) — metallic element
  • Turkish: lantan — metallic element
  • Ukrainian: ланта́н (lantán) — metallic element
  • Uzbek: lantan — metallic element
  • Uzbek: лантан (lantan) — metallic element
  • Vietnamese: lantan — metallic element
  • Volapük: lantanin — metallic element
  • Welsh: lanthanwm — metallic element
Real reading context

lanthanum in complete knowledge articles