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dorsal fin

the fin or finlike integumentary expansion generally developed on the back of aquatic vertebrates.
Origin of dorsal fin
1760-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for dorsal fin
  • It also has a thick layer of blubber and no dorsal fin so it can swim easily under the ice.
  • Each type is distinguished by dorsal fin shape, diet, and even language.
  • The nickname arises from its tendency to swim close to the surface, raising its dorsal fin above the water.
  • He had a weird growth along his dorsal fin, and that gape-mouth grimace you see in older fish.
  • dorsal fin with varying degrees of dark pigmentation.
  • Their beak is long and sharply defined and they have a tall, curved dorsal fin.
  • Orcas display a prominent dorsal fin easily seen when the animal surfaces.
  • The spiny dorsal fin has a dusky marginal band followed by a light band, then a wide dusky band near the base.
  • The finback whale has a prominent curved dorsal fin located far back on the top of its body.
  • The back is speckled brown with four dark saddles under the spiny dorsal fin.
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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