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anal fin
noun
- the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes.
anal fin
noun
- a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium
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Example Sentences
Anal fin resembling the second dorsal, greyish, with the margin dull-purple.
From Project Gutenberg
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