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dorsal fin

the fin or finlike integumentary expansion generally developed on the back of aquatic vertebrates.
Origin of dorsal fin
First recorded in 1760-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for dorsal fin
Historical Examples
  • He shot off with the bait and his dorsal fin stuck out of the water.

    Tales of Fishes Zane Grey
  • The first portion of the dorsal fin has also six flexible spines.

    The Sea Shore William S. Furneaux
  • Or if a float is used, the minnow may be hooked just under the dorsal fin.

    Bass, Pike, Perch, and Others James Alexander Henshall
  • The soft rays of the dorsal fin are blue, with orange between.

    Bass, Pike, Perch, and Others James Alexander Henshall
  • Base of the dorsal fin eight lines; its length thirteen lines.

    Lachesis Lapponica Carl von Linn
  • They are descried from the ship by means of the dorsal fin, which is above the water.

    Wanderings in South America Charles Waterton
  • His first dorsal fin is large and drawn out into a long filament.

  • Nor did he see the dorsal fin break surface and approach him from the rear.

    Jerry of the Islands Jack London
  • A dorsal fin is present in the rorquals but absent in right whales.


    Sir Ernest Shackleton
  • Mart guessed instantly that it was the dorsal fin of a shark, but he had seen no fin of such size before.

    The Pirate Shark Elliott Whitney
British Dictionary definitions for dorsal fin

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
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