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ventral fin

noun
  1. pelvic fin.
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Origin of ventral fin

First recorded in 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ventral fin

ventral fin

noun
  1. another name for pelvic fin
  2. any unpaired median fin situated on the undersurface of fishes and some other aquatic vertebrates
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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