Usually means: Bone on fish's cheek area.
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We found 8 dictionaries that define the word Praeoperculum:

General (7 matching dictionaries)
  1. praeoperculum: Wordnik
  2. praeoperculum: Wiktionary
  3. Praeoperculum, praeoperculum: Dictionary.com
  4. Praeoperculum: Online Plain Text English Dictionary
  5. Praeoperculum: AllWords.com Multi-Lingual Dictionary
  6. praeoperculum: FreeDictionary.org
  7. Praeoperculum: TheFreeDictionary.com

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

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Definitions from Wiktionary (Praeoperculum)

▸ noun:  Alternative form of preoperculum [(anatomy) The anterior opercular bone in fishes.]

Similar:
preoperculum, preopercle, preopercular, suboperculum, opercular, interoperculum, praemaxilla, operculum, subopercular, opercularization, more...

Opposite:
postoperculum, retrooperculum

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Similar:
preoperculum, preopercle, preopercular, suboperculum, opercular, interoperculum, praemaxilla, operculum, subopercular, opercularization, more...

Opposite:
postoperculum, retrooperculum



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