Usually means: Aquatic, predatory animals with tentacles.
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We found 19 dictionaries that define the word hydrozoa:

General (14 matching dictionaries)
  1. hydrozoa: Merriam-Webster
  2. Hydrozoa: Oxford Learner's Dictionaries
  3. Hydrozoa, hydrozoa: Vocabulary.com
  4. Hydrozoa: Wordnik
  5. hydrozoa: Wiktionary
  6. Hydrozoa, hydrozoa: Dictionary.com
  7. Hydrozoa: Wikipedia, the Free Encyclopedia
  8. Hydrozoa: Online Plain Text English Dictionary
  9. hydrozoa: Webster's Revised Unabridged, 1913 Edition
  10. Hydrozoa: Rhymezone
  11. Hydrozoa: AllWords.com Multi-Lingual Dictionary
  12. hydrozoa: FreeDictionary.org
  13. hydrozoa: Mnemonic Dictionary
  14. Hydrozoa: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Hydrozoa: Encyclopedia

Medicine (4 matching dictionaries)
  1. Hydrozoa: Merriam-Webster Medical Dictionary
  2. Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Hydrozoa: Medical dictionary

Definitions from Wikipedia (Hydrozoa)

noun:  (hydrozoans; ) a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.

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