ventral fin

American  

noun

1. pelvic fin.

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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

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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

Its ventral fin is peculiar, being unusually large, and of a circular shape, like boys’ playthings called “suckers.”

From A Popular Account of Dr. Livingstone's Expedition to the Zambesi and its tributaries And of the Discovery of Lakes Shirwa and Nyassa, 1858-1864 by Livingstone, David

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

A simulacrum of a ventral fin increases the resemblance.

From Social Life in the Insect World by Miall, Bernard

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