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anal fin
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noun
the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use anal fin in a sentence
Anal fin resembling the second dorsal, greyish, with the margin dull-purple.
Zoological Illustrations, Volume I|William Swainson
British Dictionary definitions for anal fin
anal fin
noun
a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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