caudal fin

American  

noun

1. the terminal vertical fin of a fish.

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caudal fin British  

noun

1. the tail fin of fishes and some other aquatic vertebrates, used for propulsion during locomotion

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Example Sentences

See Examples For:

caudal fin

They primarily rely on their dorsal fin, whereas strong swimmers use their caudal fin or back tail, Paig-Tran said.

From Los Angeles Times ● Nov. 21, 2024

"Additionally, developmental changes suggest that vertebral anatomy shifts across development to support a larger body and caudal fin."

From Science Daily ● Jan. 17, 2024

“It’s sort of unreal, when you come around the corner,” he said, looking skyward toward the caudal fin.

From The New Yorker ● May 5, 2019

There’s a soft sway to its massive caudal fin as it serenely propels the animal forward through the endless blue.

From Scientific American ● Aug. 30, 2017

Again, how swiftly the caudal fin moves when with straight unerring motion they dart upon their prey.

From A Book of Natural History Young Folks' Library Volume XIV. by Jordan, David Starr