ventral fin

noun

1. pelvic 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

Word History and Origins

Origin of ventral fin¹

First recorded in 1745–55

Example Sentences

A dorsal and ventral fin are now clearly visible; they are continuous throughout their whole length.

From Project Gutenberg

The pectoral fins are very large, the ventral fin absent, and there is a very sharp spine in front of each dorsal.

From Project Gutenberg

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

From Project Gutenberg

The ventral fin which is uppermost as the fish lies on its side and is not to show, should be carefully cut off outside the skin.

From Project Gutenberg

These fishes have no true ventral fin, and have only vestiges of side fins.

From Project Gutenberg