Definition of anal fin in English:

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anal fin

noun

Zoology
An unpaired fin located on the underside of a fish posterior to the anus.
Example sentences
  • The second dorsal and the anal fin are well-separated from the caudal fin.
  • The fleshy, stalk-like pectoral and pelvic fins and similar fleshy second dorsal and anal fins are also unlike any other marine fishes.
  • Dorsal and anal fins are typically completely formed by the time the fish has reached 7-13 mm.

For editors and proofreaders

Syllabification: a·nal fin

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