tail fin


Definition of tail fin

1 : the terminal fin of a fish or cetacean

Examples of tail fin in a Sentence

Recent Examples on the Web Mediterranean dealfish: The species swims vertically and lets its nonfunctional tail fin drift behind. Leslie Nemo, Scientific American, 8 June 2021 The tri-wing design, with a double tail fin and two engines mounted to the rear, will be able to accommodate 264 passengers, but will consume 70 percent less fuel than a similar-sized jet. Michael Verdon, Robb Report, 13 May 2021 In the meantime there's this whole tail fin that's come from underwater in Cuba. Ruth Kinane, EW.com, 31 Mar. 2021 For now, the research team used the shape of the fossil’s vertebrae and the skeleton of its tail fin to classify it as a shark in the order Lamniformes, which includes filter-feeding sharks, mako sharks and the great white. Theresa Machemer, Smithsonian Magazine, 22 Mar. 2021 But the animal’s tail fin—and the rest of its body plan—more closely resembles modern tiger sharks. Gretchen Vogel, Science | AAAS, 18 Mar. 2021 The eagle shark was likely a slow swimmer that used its tail fin to propel itself and its pectoral fins to maneuver—and maybe add extra speed. Gretchen Vogel, Science | AAAS, 18 Mar. 2021 F-15Es could move the bombs faster and deliver them complete, with guidance and tail fin kits already assembled. Kyle Mizokami, Popular Mechanics, 3 Mar. 2021 Such tactical use of the tail fin during hunting — which was previously observed only in mammals such as dolphins and killer whales — might indicate that sharks are more intelligent than scientists thought. Josh Howgego, Scientific American, 11 July 2013

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tail fin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of tail fin

1681, in the meaning defined at sense 1

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Time Traveler for tail fin

Time Traveler

The first known use of tail fin was in 1681

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Statistics for tail fin

Last Updated

21 Jul 2021

Cite this Entry

“Tail fin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tail%20fin. Accessed 23 Jul. 2021.

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More Definitions for tail fin

tail fin


English Language Learners Definition of tail fin

: a fin at the back end of a fish, whale, etc.
: a decorative part on the back of a car that is shaped like a fish's fin


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