pectoral fin

noun

: either of the fins of a fish that correspond to the forelimbs of a quadruped

Examples of pectoral fin in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 However, larger bodies require more energy to move, reinforcing the selection for higher pectoral fin aspect ratios. Melissa Cristina Marquez, Forbes, 1 Nov. 2024 The other study examines the genetics that allowed the fish to repurpose pectoral fins into legs. Gary Stix, Scientific American, 26 Sep. 2024 See All Example Sentences for pectoral fin

Word History

First Known Use

1715, in the meaning defined above

Time Traveler
The first known use of pectoral fin was in 1715

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Cite this Entry

“Pectoral fin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pectoral%20fin. Accessed 12 Mar. 2025.

Kids Definition

pectoral fin

noun
: either of a pair of fins of a fish that correspond to the front limbs of a four-footed animal compare pelvic fin

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