Definitions for "Ventral fin"
Keywords:  fin, pelvic, belly, vertebrate, sorne
fin on the underside of fishes and sorne other aquatic vertebrates.
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
stabilizing surface attached to the undersurface of an aircraft, commonly called a belly fin