heterocercal

adjective het·ero·cer·cal \ ˌhe-tə-rō-ˈsər-kəl \

Definition of heterocercal

1 of a fish tail fin : having the upper lobe larger than the lower with the vertebral column extending into the upper lobe
2 : having or relating to a heterocercal tail fin

First Known Use of heterocercal

1838

in the meaning defined at sense 1

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