V
- Vent: the external opening of the alimentary canal, the anus
- Ventral: pertaining to the abdominal or lower surface
- Ventral fins: paired fins behind or below the pectoral fins
- Vertical fins: fins on the median line of the body; the dorsal, anal, and caudal fins
- Vestigial: reduced, or very poorly developed
- Villiform teeth: small, slender teeth forming velvety bands
- Vomer: a bone forming the front part of the roof of the mouth
- Vomerine teeth: teeth on the vomer (see above)
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