1. nearest to or facing toward the axis of an organ or organism
e.g. the upper side of a leaf is known as the adaxial surface
Synonym: adaxial
2. toward or on or near the belly (front of a primate or lower surface of a lower animal)
e.g. 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