: either of the fins of a fish that correspond to the forelimbs of a quadruped
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The singing whale was identified by its distinctive black pectoral fin markings as TCI-847.—Brendan Rascius, Miami Herald, 22 Apr. 2025 The study found evidence supporting the idea that pectoral fin shape is an adaptive trait shaped by ecological demands.—Melissa Cristina Marquez, Forbes, 1 Nov. 2024 Its propulsion system incorporates two soft, flexible, 6-mm-thick rubber membranes which serve as pectoral fins.—Ben Coxworth, New Atlas, 23 Feb. 2025 This bizarre creature really is a fish, despite its bullfrog face, pectoral fins that look like webbed feet, and a froglike mouth that snaps up unsuspecting prey.—Elizabeth Rayne, Ars Technica, 30 Dec. 2024 See All Example Sentences for pectoral fin
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