from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A fleshy rayless fin located on the back of a fish between the dorsal fin and the caudal fin, found in certain fishes such as salmon, trout, and catfishes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun ichthyology A soft, fleshy fin found on the back of a fish behind the dorsal fin and just forward of the caudal fin.


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