ventral fin


1745–55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ventral fin
1.  another name for pelvic fin
2.  any unpaired median fin situated on the undersurface of fishes and some other aquatic vertebrates

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
All chinook must be adipose and/or ventral fin clipped to be retained.
Hatchery steelhead are identified by a missing adipose or ventral fin and a
  healed scar in the location of the missing fin.
The airplane was not equipped with a lower surface ventral fin.
Release wild steelhead and right ventral fin clipped steelhead.
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