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(Zoology) the tail fin of fishes and some other aquatic vertebrates, used for propulsion during locomotion
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|Noun||1.||caudal fin - the tail of fishes and some other aquatic vertebrates|
fin - organ of locomotion and balance in fishes and some other aquatic animals
heterocercal fin - a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks
homocercal fin - symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes
fish - any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills; "the shark is a large fish"; "in the living room there was a tank of colorful fish"