Usually means: Chemical element, soft, silvery metal.
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We found 27 dictionaries that define the word lanthanum:

General (19 matching dictionaries)
  1. lanthanum: Merriam-Webster
  2. lanthanum: Oxford Learner's Dictionaries
  3. lanthanum: Collins English Dictionary
  4. lanthanum: Vocabulary.com
  5. Lanthanum, lanthanum: Wordnik
  6. lanthanum: Wiktionary
  7. lanthanum: Webster's New World College Dictionary, 4th Ed.
  8. lanthanum: The Wordsmyth English Dictionary-Thesaurus
  9. lanthanum: Infoplease Dictionary
  10. lanthanum: Dictionary.com
  11. lanthanum: Online Etymology Dictionary
  12. Lanthanum: Wikipedia, the Free Encyclopedia
  13. Lanthanum: Online Plain Text English Dictionary
  14. lanthanum: Webster's Revised Unabridged, 1913 Edition
  15. lanthanum: Rhymezone
  16. Lanthanum: AllWords.com Multi-Lingual Dictionary
  17. lanthanum: FreeDictionary.org
  18. lanthanum: Mnemonic Dictionary
  19. lanthanum: TheFreeDictionary.com

Business (1 matching dictionary)
  1. lanthanum: Financial dictionary

Computing (1 matching dictionary)
  1. lanthanum: Encyclopedia

Medicine (5 matching dictionaries)
  1. lanthanum: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. online medical dictionary (No longer online)
  5. lanthanum: Medical dictionary

Science (1 matching dictionary)
  1. lanthanum: WebElements Periodic Table of the Elements

Definitions from Wiktionary (lanthanum)

noun:  (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.
noun:  (countable) An atom of this element.

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