: having a fin or fins
… the real stars of underwater acoustics are the finned marine mammals, including whales, porpoises and dolphins.Todd Preston
a finned Cadillac
a finned cylinder
often used in combination
The first postwar car with fins and V-8 power set a mood of exuberance that reached its peak with the shark-finned Caddy of 1959.Joseph R. Szczesny

Examples of finned 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.
The team evaluated the size of the ancient octopuses using allometric calculation—a method that used the proportional growth rates of modern, long-bodied finned octopuses to extrapolate the size of their extinct relatives. Jacek Krywko, ArsTechnica, 24 Apr. 2026 This new species of finned octopus suggests a more complex picture — one where giant, intelligent invertebrates also held power at the top of the food chain. Ryan Brennan, Kansas City Star, 24 Apr. 2026 The fossils belonged to a group of extinct finned octopuses known as Cirrata that researchers believed crushed their prey with powerful jaws. Brie Stimson, FOXNews.com, 24 Apr. 2026 The researchers determined that the fossils, which came from Japan and Vancouver Island, off Canada’s Pacific Coast, represent two species in a group known as the finned octopuses, Nanaimoteuthis jeletzkyi and Nanaimoteuthis haggarti. Kate Wong, Scientific American, 23 Apr. 2026 See All Example Sentences for finned

Word History

First Known Use

14th century, in the meaning defined above

Time Traveler
The first known use of finned was in the 14th century

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Cite this Entry

“Finned.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/finned. Accessed 1 May. 2026.

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