Definition of pectoral fin in English:

pectoral fin

Syllabification: pec·to·ral fin

noun

Zoology
  • Each of a pair of fins situated on either side just behind a fish’s head, helping to control the direction of movement during locomotion. They correspond to the forelimbs of other vertebrates.
    More example sentences
    • Paired pectoral fins and a dorsal fin were present, and the caudal fin was asymmetrical with a large upper lobe.
    • One of the fossil's most intriguing aspects is the large, paired spines on the shark's pectoral fins, the side fins used for steering.
    • Look at the shape and size of the dorsal fin, pectoral fins, and the caudal fin.

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