of, pertaining to, or situated near, the belly, or ventral side, of an animal or of one of its parts; hemal; abdominal; as, the ventral fin of a fish; the ventral root of a spinal nerve; -- opposed to dorsal.-of or pertaining to that surface of a carpel, petal, etc., which faces toward the center of a flower.-of or pertaining to the lower side or surface of a creeping moss or other low flowerless plant.  opposed to dorsal.