Usually means: Lid covering gills in fish.
Definitions Related words Phrases Mentions History
We found 32 dictionaries that define the word operculum:

General (21 matching dictionaries)
  1. operculum: Merriam-Webster
  2. operculum: Oxford Learner's Dictionaries
  3. operculum: American Heritage Dictionary of the English Language
  4. operculum: Collins English Dictionary
  5. operculum: Vocabulary.com
  6. operculum: Wordnik
  7. Operculum, Operculum: InfoVisual Visual Dictionary
  8. operculum: Wiktionary
  9. operculum: Webster's New World College Dictionary, 4th Ed.
  10. operculum: The Wordsmyth English Dictionary-Thesaurus
  11. operculum: Infoplease Dictionary
  12. operculum: Dictionary.com
  13. Operculum (animal), Operculum (bird), Operculum (botany), Operculum (brain), Operculum (bryozoa), Operculum (dentistry), Operculum (fish), Operculum (gastropod), Operculum: Wikipedia, the Free Encyclopedia
  14. Operculum: Online Plain Text English Dictionary
  15. operculum: Webster's Revised Unabridged, 1913 Edition
  16. operculum: Rhymezone
  17. Operculum: AllWords.com Multi-Lingual Dictionary
  18. operculum: FreeDictionary.org
  19. operculum: The Phrontistery - A Dictionary of Obscure Words
  20. operculum: Mnemonic Dictionary
  21. operculum: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Operculum (gastropod), operculum: Encyclopedia

Medicine (4 matching dictionaries)
  1. operculum: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. operculum: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. operculum: Wordcraft Dictionary

Science (5 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. Bryological (No longer online)
  3. Flora of New South Wales (No longer online)
  4. Operculum: The Orchid Lady's Illustrated Orchid Encyclopedia
  5. Fishkeeping glossary (No longer online)

(Note: See opercula as well.)

Definitions from Wiktionary (operculum)

noun:  (zoology) A covering flap in animals, such as a gill cover.
noun:  (botany) The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.
noun:  (dentistry) A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.
noun:  A structure which serves as a cover or lid.
noun:  (anatomy) One of several flaps of cerebral cortex covering the insula.

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