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A fin, such as a pelvic fin or an anal fin, that is found on the ventral side of a fish.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Zoology) another name for pelvic fin
2. (Zoology) any unpaired median fin situated on the undersurface of fishes and some other aquatic vertebrates
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||ventral fin - either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate|
fin - organ of locomotion and balance in fishes and some other aquatic animals
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