Dictionary.com
definitions

anal fin

noun

the median, unpaired fin on the ventral margin between the anus and the caudal fin in fishes.

RELATED CONTENT

DVDA
Read more in this article about some frequently asked questions and fun facts related to our definitions.
READ MORE
ATW: What Does 💦 - Sweat Droplets Emoji Mean? | Dictionary.com
Read more in this article about some frequently asked questions and fun facts related to our definitions.
READ MORE
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012