Usually means: Protective cup surrounding hydroid polyps.
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We found 14 dictionaries that define the word hydrotheca:

General (12 matching dictionaries)
  1. hydrotheca: Merriam-Webster
  2. hydrotheca: Collins English Dictionary
  3. hydrotheca: Wordnik
  4. hydrotheca: Wiktionary
  5. hydrotheca: Infoplease Dictionary
  6. Hydrotheca, hydrotheca: Dictionary.com
  7. Hydrotheca: Wikipedia, the Free Encyclopedia
  8. Hydrotheca: Online Plain Text English Dictionary
  9. hydrotheca: Webster's Revised Unabridged, 1913 Edition
  10. Hydrotheca: AllWords.com Multi-Lingual Dictionary
  11. hydrotheca: FreeDictionary.org
  12. Hydrotheca: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. hydrotheca: Encyclopedia

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

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Definitions from Wiktionary (hydrotheca)

▸ noun:  (zoology) One of the calicles that protect the hydranths in certain Hydroidea (Thecaphora).

Similar:
hydrocladium, hydroecium, hydrœcium, hydrophyllium, phyllocyst, hydranth, hydrozoan, hydrosoma, hypotheca, hydractinian, more...

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Similar:
hydrocladium, hydroecium, hydrœcium, hydrophyllium, phyllocyst, hydranth, hydrozoan, hydrosoma, hypotheca, hydractinian, more...



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