: either of the fins of a fish that correspond to the forelimbs of a quadruped
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Brown and yellow bullheads have the rear edge of their pectoral fin spine serrated with sharp tooth-like projections.—Ken Perrotte, Outdoor Life, 4 June 2026 By midmorning, rescuers began moving a fire hose under the whale’s belly and around his pectoral fins.—Jessica Camille Aguirre, New Yorker, 2 May 2026 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 See All Example Sentences for pectoral fin