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- Dictionarydorsal fin
noun
- 1. an unpaired fin on the back of a fish or whale, e.g. the tall triangular fin of a shark or killer whale.
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noun
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A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments, including most numerously ... Wikipedia