ventral fin

American  

noun

1. pelvic fin.

---

ventral fin British  

noun

1. another name for pelvic fin

2. any unpaired median fin situated on the undersurface of fishes and some other aquatic vertebrates

---

Etymology

Origin of ventral fin

First recorded in 1745–55

Example Sentences

All Chinook must be adipose and/or ventral fin clipped to be retained.

From Seattle Times • Jul. 29, 2012

Destitute of the ventral fin, as the eels.

From Webster's Unabridged Dictionary by Webster, Noah

There is a species of carp with red ventral fin, which is caught and used in very large quantities: it is called "pumbo."

From The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873 Continued By A Narrative Of His Last Moments And Sufferings, Obtained From His Faithful Servants Chuma And Susi by Waller, Horace

The gills flat, unarmed; pectoral fin subacute, triangular; ventral fin triangular, supported by a very strong first ray; dorsal and anal fins rounded.

From Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 by King, Phillip Parker

Do not cut off the ventral fin on the side which is to be displayed.

From Home Taxidermy for Pleasure and Profit A Guide for Those Who Wish to Prepare and Mount Animals, Birds, Fish, Reptiles, etc., for Home, Den, or Office Decoration by Farnham, Albert B.