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.
Asian swamp eels have no pectoral fins. — Sarah Perkel, USA Today, 15 Apr. 2026 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 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 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

Rhymes for pectoral fin

See All Rhymes for pectoral fin

Browse Nearby Words

pectoral cross
pectoral fin
pectoral girdle
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Cite this Entry

“Pectoral fin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pectoral%20fin. Accessed 8 Jul. 2026.

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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

More from Merriam-Webster on pectoral fin

Britannica.com: Encyclopedia article about pectoral fin

Last Updated: - Updated example sentences
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