Usually means: Radioactive metal, first actinide series.
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We found 28 dictionaries that define the word actinium:

General (20 matching dictionaries)
  1. actinium: Merriam-Webster
  2. actinium: Oxford Learner's Dictionaries
  3. actinium: American Heritage Dictionary of the English Language
  4. actinium: Collins English Dictionary
  5. actinium: Vocabulary.com
  6. actinium: Wordnik
  7. actinium: Wiktionary
  8. actinium: Webster's New World College Dictionary, 4th Ed.
  9. actinium: The Wordsmyth English Dictionary-Thesaurus
  10. actinium: Infoplease Dictionary
  11. actinium: Dictionary.com
  12. Actinium: Wikipedia, the Free Encyclopedia
  13. Actinium: Online Plain Text English Dictionary
  14. actinium: Webster's Revised Unabridged, 1913 Edition
  15. actinium: Rhymezone
  16. Actinium: AllWords.com Multi-Lingual Dictionary
  17. actinium: FreeDictionary.org
  18. actinium: Mnemonic Dictionary
  19. actinium: TheFreeDictionary.com
  20. actinium: Merriam-Webster

Computing (1 matching dictionary)
  1. actinium: Encyclopedia

Medicine (5 matching dictionaries)
  1. actinium: 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. actinium: Medical dictionary

Science (2 matching dictionaries)
  1. Actinium: Extragalactic Astronomy
  2. Actinium, actinium: WebElements Periodic Table of the Elements

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Definitions from Wiktionary (actinium)

▸ noun:  A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

Similar:
AC, atomic number 89, protactinium, actinide, actinium-K, protoactinium, actinium K, actinon, actinouranium, americium, more...

Phrases:
actinium series, actinium emanation, Isotopes of actinium, more...

Adjectives:
pure, separate, uranium, little, trivalent, third, new, precipitate, proto, purified



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Similar:
AC, atomic number 89, protactinium, actinide, actinium-K, protoactinium, actinium K, actinon, actinouranium, americium, more...

Phrases:
actinium series, actinium emanation, Isotopes of actinium, more...

Adjectives:
pure, separate, uranium, little, trivalent, third, new, precipitate, proto, purified



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