Definition of dorsal fin in English:

dorsal fin

Syllabification: dor·sal fin

noun

Zoology
  • An unpaired fin on the back of a fish or whale, e.g., the tall triangular fin of a shark or killer whale.
    More example sentences
    • It has two dorsal fins and a caudal fin or tail like that of a shark.
    • They have one caudal fin, one dorsal fin, two pelvic fins, one anal fin, and two pectoral fins.
    • This is the pattern seen in the dorsal fins of fishes, in Dimetrodon and among iguanid lizards.

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