1. A fin located on the back of a fish or marine mammal, used for stability and direction control during swimming
The shark's dorsal fin cuts through the water as it swims.
A barbatana dorsal do tubarão corta a água enquanto nada.
2. In anatomy, any fin-like structure on the dorsal surface of an aquatic animal
The dolphin has a prominent dorsal fin on its back.
O golfinho tem uma barbatana dorsal proeminente em seu dorso.