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We found 15 dictionaries with English definitions that include the word protoactinium:
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General dictionaries General (12 matching dictionaries)
  1. protoactinium: Collins English Dictionary [home, info]
  2. protoactinium: Vocabulary.com [home, info]
  3. protoactinium: Wiktionary [home, info]
  4. protoactinium: Webster's New World College Dictionary, 4th Ed. [home, info]
  5. protoactinium: Infoplease Dictionary [home, info]
  6. protoactinium: Dictionary.com [home, info]
  7. protoactinium: Rhymezone [home, info]
  8. protoactinium: Free Dictionary [home, info]
  9. protoactinium: Mnemonic Dictionary [home, info]
  10. protoactinium: WordNet 1.7 Vocabulary Helper [home, info]
  11. protoactinium: LookWAYup Translating Dictionary/Thesaurus [home, info]
  12. protoactinium: Dictionary/thesaurus [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. protoactinium: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. protoactinium: online medical dictionary [home, info]
  2. protoactinium: Medical dictionary [home, info]

Quick definitions from WordNet (protoactinium)

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

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Words similar to protoactinium:   pa, protactinium, atomic number 91, more...

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