Usually means: Protective flap over fish gills.
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We found 9 dictionaries that define the word gill cover:

General (8 matching dictionaries)
  1. gill cover: Merriam-Webster
  2. gill cover: Oxford Learner's Dictionaries
  3. gill cover: Wordnik
  4. gill cover: Wiktionary
  5. Gill cover, gill cover: Dictionary.com
  6. Gill cover: Wikipedia, the Free Encyclopedia
  7. gill cover: FreeDictionary.org
  8. Gill cover: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. gill cover: Encyclopedia

Definitions from Wiktionary (gill cover)

noun:  (anatomy, zoology) An operculum; a series of bones found in bony fish that serves as a facial support structure and a protective covering for the gills.

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