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dorsal fin

noun
1.
the fin or finlike integumentary expansion generally developed on the back of aquatic vertebrates.
Origin of dorsal fin
1760-1770
1760-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for dorsal fin

dorsal fin

noun
1.
any unpaired median fin on the backs of fishes and some other aquatic vertebrates: maintains balance during locomotion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for dorsal

7
8
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