Usually means: Ventral fin on fish underside.
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We found 12 dictionaries that define the word anal fin:

General (10 matching dictionaries)
  1. anal fin: Merriam-Webster.com
  2. anal fin: Oxford Learner's Dictionaries
  3. anal fin: Collins English Dictionary
  4. Anal fin: InfoVisual Visual Dictionary
  5. anal fin: Wiktionary
  6. anal fin: Infoplease Dictionary
  7. anal fin: Dictionary.com
  8. Anal fin: Wikipedia, the Free Encyclopedia
  9. anal fin: Dictionary/thesaurus
  10. anal fin: Merriam-Webster.com

Computing (1 matching dictionary)
  1. anal fin: Encyclopedia

Science (1 matching dictionary)
  1. Fishkeeping glossary (No longer online)

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Definitions from Wiktionary (anal fin)

▸ noun:  (ichthyology) A fin located on the underside of a fish behind the anus.

Similar:
pelvic fin, abdominal fin, ventral fin, backfin, dorsal fin, tailfin, hindfin, adipose fin, finne, pectoral fin, more...

Opposite:
dorsal fin, pectoral fin, pelvic fin

▸ Words similar to anal fin

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Similar:
pelvic fin, abdominal fin, ventral fin, backfin, dorsal fin, tailfin, hindfin, adipose fin, finne, pectoral fin, more...

Opposite:
dorsal fin, pectoral fin, pelvic fin



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