Usually means: Radioactive metallic element used nuclear.
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We found 36 dictionaries that define the word plutonium:

General (23 matching dictionaries)
  1. plutonium: Longman Dictionary of Contemporary English
  2. plutonium: Merriam-Webster
  3. plutonium: Oxford Learner's Dictionaries
  4. plutonium: American Heritage Dictionary of the English Language
  5. plutonium: Collins English Dictionary
  6. plutonium: Vocabulary.com
  7. Plutonium, plutonium: Wordnik
  8. plutonium: Cambridge Advanced Learner's Dictionary
  9. plutonium: Wiktionary
  10. plutonium: Webster's New World College Dictionary, 4th Ed.
  11. plutonium: The Wordsmyth English Dictionary-Thesaurus
  12. plutonium: Infoplease Dictionary
  13. plutonium: Dictionary.com
  14. plutonium: Online Etymology Dictionary
  15. plutonium: Cambridge Essential American English Dictionary
  16. Plutonium: Wikipedia, the Free Encyclopedia
  17. plutonium: Rhymezone
  18. plutonium: FreeDictionary.org
  19. plutonium: Mnemonic Dictionary
  20. plutonium: TheFreeDictionary.com
  21. plutonium: Wikimedia Commons US English Pronunciations

Art (1 matching dictionary)
  1. An Etymological Dictionary of Classical Mythology (No longer online)

Computing (1 matching dictionary)
  1. Plutonium (Pu), plutonium: Encyclopedia

Medicine (5 matching dictionaries)
  1. plutonium: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. online medical dictionary (No longer online)
  5. Plutonium (Pu), plutonium: Medical dictionary

Science (3 matching dictionaries)
  1. Plutonium: Extragalactic Astronomy
  2. Plutonium (Pu): NRC Glossary of Nuclear Terms --
  3. Plutonium, plutonium: WebElements Periodic Table of the Elements

Slang (1 matching dictionary)
  1. Plutonium: Urban Dictionary

Tech (2 matching dictionaries)
  1. Explosives (No longer online)
  2. Nuclear Terms (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive actinide metal that tarnishes when exposed to air.
noun:  (countable, historical) Alternative form of ploutonion [(historical) A sanctuary dedicated to the Ancient Greek and Roman god Pluto, usually at a location producing poisonous emissions, believed to represent an entrance to the underworld.]

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