dorsal fin


noun

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
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

dorsal fin

noun

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