WordWeb Online

1. Toward or on or near the belly (front of a primate or lower surface of a lower animal)
   "the ventral aspect of the human body"; "the liver is somewhat ventral in position"; "ventral (or pelvic) fins correspond to the hind limbs of a quadruped"
    
2. (biology) nearest to or facing toward the axis of an organ or organism
   "the upper side of a leaf is known as the ventral surface";
   - adaxial

See also: dorsoventral

Antonym: dorsal

Encyclopedia: Ventral