Usually means: Sea anemone, a marine organism.
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We found 19 dictionaries that define the word actinia:

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

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

(Note: See actinias as well.)

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Definitions from Wiktionary (actinia)

▸ noun:  A sea anemone, specifically a member of the genus Actinia.

Similar:
actinian, actiniarian, genus actinia, actinarian, actiniid, actiniarid, actinioidean, sea anemone, actinostolid, anemone, more...

Types:
anemone, corallimorph, sea anemone, carpet anemone, clam, tube anemone, more...

Phrases:
genus actinia, more...

Adjectives:
common, certain, young, small, typical, parasitic, new, insignificant, dissected

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Similar:
actinian, actiniarian, genus actinia, actinarian, actiniid, actiniarid, actinioidean, sea anemone, actinostolid, anemone, more...

Types:
anemone, corallimorph, sea anemone, carpet anemone, clam, tube anemone, more...

Phrases:
genus actinia, more...

Adjectives:
common, certain, young, small, typical, parasitic, new, insignificant, dissected



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