Usually means: Atomic number of lanthanum element.
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We found 7 dictionaries that define the word atomic number 57:

General (6 matching dictionaries)
  1. atomic number 57: Vocabulary.com
  2. atomic number 57: Dictionary.com
  3. Atomic number 57: Rhymezone
  4. atomic number 57: FreeDictionary.org
  5. atomic number 57: Mnemonic Dictionary
  6. atomic number 57: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 57: Encyclopedia

Definitions from WordNet (Atomic number 57)

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


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