homocercal fin
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Related to homocercal fin: heterocercal fin
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| Noun | 1. | homocercal fin - symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes caudal fin, tail fin - the tail of fishes and some other aquatic vertebrates heterocercal fin - a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks |