the fin or finlike integumentary expansion generally developed on the back of aquatic vertebrates.
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Origin of dorsal fin
First recorded in 1760–70
Words nearby dorsal fin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for dorsal fin
In the figure there is represented the cross-section of a fish (its dorsal-fin D) just before the spear strikes.Along Alaska's Great River|Frederick Schwatka
British Dictionary definitions for dorsal fin
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