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We found 7 dictionaries that define the word atomic number 91:

General (6 matching dictionaries)
  1. atomic number 91: Vocabulary.com
  2. atomic number 91: Dictionary.com
  3. Atomic number 91: Rhymezone
  4. atomic number 91: FreeDictionary.org
  5. atomic number 91: Mnemonic Dictionary
  6. atomic number 91: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. atomic number 91: Encyclopedia

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Definitions from WordNet (Atomic number 91)

▸ noun:  a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead


Opposite:
protactinium, Pa

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Opposite:
protactinium, Pa




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