WordReference Random House Unabridged Dictionary of American English © 2026
a′nal fin′, 
  1. Fishthe median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes. See diag. under fish. 

Collins Concise English Dictionary © HarperCollins Publishers::
anal fin n
  1. a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium
'anal fin' also found in these entries (note: many are not synonyms or translations):
javelin fish - silurid - featherback - gonopodium - pink salmon

Forum discussions with the word(s) "anal fin" in the title:


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