"ventral" in the adjective sense
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. adaxial, ventral
nearest to or facing toward the axis of an organ or organism
"the upper side of a leaf is known as the adaxial surface"
Source: WordNet® (An amazing lexical database of English)
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