Usually means: Electron orbitals in lanthanide elements.
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We found 6 dictionaries that define the word 4F:

General (4 matching dictionaries)
  1. 4F: Wiktionary
  2. 4f: Dictionary.com
  3. 4f, 4F (company), 4F (military conscription), 4F: Wikipedia, the Free Encyclopedia
  4. 4F (draft classification): The Word Detective

Miscellaneous (1 matching dictionary)
  1. 4F: Acronym Finder

Slang (1 matching dictionary)
  1. 4F: Green’s Dictionary of Slang


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