[1] : The Collaborative International Dictionary of English v.0.48

ventral \ven"tral\, a. l. ventralis, fr. venter the belly;
   perhaps akin to g. wanst: cf. f. ventral.
   1. anat. 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.
      1913 webster

   2. bot.
      a of or pertaining to that surface of a carpel, petal,
          etc., which faces toward the center of a flower.
      b of or pertaining to the lower side or surface of a
          creeping moss or other low flowerless plant. opposed
          to dorsal.
          1913 webster

   ventral fins zool., the posterior pair of fins of a fish.
      they are often situated beneath the belly, but sometimes
      beneath the throat.

   ventral segment. acoustics see loop, n., 5.
      1913 webster
see also:
dorsal ventral fins ventral segment loop 

Ventral >> V Words
Ventral, definition of term: Ventral
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Fins >> F Words
Fins, definition of term: Fins
fins_pag1.html