Usually means: Colonial hydroids resembling sea anemones.
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We found 10 dictionaries that define the word hydractinian:

General (9 matching dictionaries)
  1. hydractinian: Merriam-Webster
  2. hydractinian: Wordnik
  3. hydractinian: Wiktionary
  4. Hydractinian, hydractinian: Dictionary.com
  5. Hydractinian: Online Plain Text English Dictionary
  6. hydractinian: Webster's Revised Unabridged, 1913 Edition
  7. Hydractinian: AllWords.com Multi-Lingual Dictionary
  8. hydractinian: FreeDictionary.org
  9. Hydractinian: TheFreeDictionary.com

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

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Definitions from Wiktionary (hydractinian)

▸ noun:  (biology) A marine hydroid of the genus Hydractinia or a closely-related genus

Similar:
hydranth, hydrorhiza, hydrotheca, hydrozoan, hydrosome, hydrœcium, hydrosoma, hydroecium, hydroid, hydrocladium, more...

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Similar:
hydranth, hydrorhiza, hydrotheca, hydrozoan, hydrosome, hydrœcium, hydrosoma, hydroecium, hydroid, hydrocladium, more...



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