: either of the fins of a fish that correspond to the forelimbs of a quadruped
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Asian swamp eels have no pectoral fins.—Sarah Perkel, USA Today, 15 Apr. 2026 The lengthy pre-copulation stage involved all three sharks motionless on the seafloor for nearly an hour, after which the female started swimming with one male shark biting onto each of her pectoral fins.—Jennifer Ouellette, ArsTechnica, 23 Sep. 2025 Ghost sharks use their forehead teeth to grip a female mate's pectoral fins while reproducing, according to video records examined in the study.—Staff Author, PEOPLE, 10 Sep. 2025 Speaking of the battery, it's integrated directly into the pectoral fins.—New Atlas, 8 Sep. 2025 See All Example Sentences for pectoral fin