Usually means: Radioactive metallic element, atomic number 91.
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We found 14 dictionaries that define the word protoactinium:

General (10 matching dictionaries)
  1. protoactinium: Collins English Dictionary
  2. protoactinium: Vocabulary.com
  3. protoactinium: Wiktionary
  4. protoactinium: Webster's New World College Dictionary, 4th Ed.
  5. protoactinium: Infoplease Dictionary
  6. protoactinium: Dictionary.com
  7. protoactinium: Rhymezone
  8. protoactinium: FreeDictionary.org
  9. protoactinium: Mnemonic Dictionary
  10. protoactinium: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. protoactinium: Encyclopedia

Medicine (3 matching dictionaries)
  1. protoactinium: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. protoactinium: Medical dictionary

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Definitions from Wiktionary (Protoactinium)

▸ noun:  Dated form of protactinium. [A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.]

Similar:
atomic number 91, pa, protactinium, actinium, actinide, protium, positronium, prothallium, actinolite, protonation, more...

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Similar:
atomic number 91, pa, protactinium, actinium, actinide, protium, positronium, prothallium, actinolite, protonation, more...



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