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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Word of the day conspicuous
Pronunciation: kənˈspikyo͞oəs
adjective
standing out so as to be clearly visible