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adipose fin

noun
1.
a small, fleshy fin, usually lacking rays, behind the main dorsal fin in trouts, catfishes, and other bony fishes.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for adipose-fin

adipose fin

noun
1.
a posterior dorsal fin occurring in some fish, such as those of the salmon and catfish families
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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10
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