Definition of anal fin in English:

anal fin

Line breaks: anal fin

noun

Zoology
  • An unpaired fin located on the underside of a fish posterior to the anus.
    More 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.

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