: either of the fins of a fish that correspond to the forelimbs of a quadruped
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Speaking of the battery, it's integrated directly into the pectoral fins.—New Atlas, 8 Sep. 2025 They are so named for the black color on the tips of their dorsal and pectoral fins.—David Goodhue, Miami Herald, 3 Sep. 2025 The sighting involved tail slapping and the whales slapping their pectoral fin against the ocean’s surface, boaters said.—Paloma Chavez
august 22, Sacbee.com, 22 Aug. 2025 Easily recognized by their slender bodies, long pectoral fins, and rounded snouts, this species is often seen cruising in the open ocean, particularly along the edges of continental shelves, around seamounts, and near offshore reefs.—Melissa Cristina Márquez, Forbes.com, 6 Aug. 2025 See All Example Sentences for pectoral fin
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