Definition of anal fin
in fishes
: a median unpaired fin on the lower posterior part of the body behind the vent and sometimes confluent with the caudal fin — see fish illustration
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“Anal fin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/anal%20fin. Accessed 8 Aug. 2022.
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Time Traveler for anal fin
The first known use of anal fin was in 1769
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