What is the meaning of ventral?

adjective

• Toward or on or near the belly (front of a primate or lower surface of a lower animal))
  • usage: "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"
• Nearest to or facing toward the axis of an organ or organism.
  • usage: "the upper side of a leaf is known as the adaxial surface"
  • synonyms: adaxial