Usually means: Bone on fish cheek region.
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We found 10 dictionaries that define the word preoperculum:

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

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

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Definitions from Wiktionary (preoperculum)

▸ noun:  (anatomy) The anterior opercular bone in fishes.

Similar:
opercular, preopercular, interoperculum, preopercle, preopercule, subopercular, opercularization, opercularisation, operculum, operculectomy, more...

Opposite:
postoperculum, operculum posterior

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Similar:
opercular, preopercular, interoperculum, preopercle, preopercule, subopercular, opercularization, opercularisation, operculum, operculectomy, more...

Opposite:
postoperculum, operculum posterior



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