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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The main fin located on the back of fishes and certain marine mammals.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fin located on the backs of fish and some marine mammals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance


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