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We found 25 dictionaries with English definitions that include the word protactinium:
Click on the first link on a line below to go directly to a page where "protactinium" is defined.

General dictionaries General (19 matching dictionaries)
  1. protactinium: Oxford Dictionaries [home, info]
  2. protactinium: American Heritage Dictionary of the English Language [home, info]
  3. protactinium: Collins English Dictionary [home, info]
  4. protactinium: Vocabulary.com [home, info]
  5. protactinium: Merriam-Webster's Online Dictionary, 11th Edition [home, info]
  6. protactinium: Wordnik [home, info]
  7. Protactinium: Wiktionary [home, info]
  8. protactinium: Webster's New World College Dictionary, 4th Ed. [home, info]
  9. protactinium: The Wordsmyth English Dictionary-Thesaurus [home, info]
  10. protactinium: Infoplease Dictionary [home, info]
  11. protactinium: Dictionary.com [home, info]
  12. protactinium: UltraLingua English Dictionary [home, info]
  13. Protactinium: Wikipedia, the Free Encyclopedia [home, info]
  14. protactinium: Rhymezone [home, info]
  15. protactinium: Free Dictionary [home, info]
  16. protactinium: Mnemonic Dictionary [home, info]
  17. protactinium: WordNet 1.7 Vocabulary Helper [home, info]
  18. protactinium: LookWAYup Translating Dictionary/Thesaurus [home, info]
  19. protactinium: Dictionary/thesaurus [home, info]

Business dictionaries Business (1 matching dictionary)
  1. protactinium: Financial dictionary [home, info]

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

Medicine dictionaries Medicine (3 matching dictionaries)
  1. Protactinium: Medical Dictionary [home, info]
  2. protactinium: online medical dictionary [home, info]
  3. protactinium: Medical dictionary [home, info]

Science dictionaries Science (1 matching dictionary)
  1. Protactinium, protactinium: WebElements Periodic Table of the Elements [home, info]

Quick definitions from WordNet (protactinium)

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

Phrases that include protactinium:   protactinium 229, protactinium 231, protactinium chloride, protactinium pentachloride

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

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