homocercal

adjective
ho·​mo·​cer·​cal | \ˌhō-mə-ˈsər-kəl, ˌhä-\

Definition of homocercal 

1 of a fish tail fin : having the upper and lower lobes approximately symmetrical and the vertebral column ending at or near the middle of the base

2 : having or relating to a homocercal tail fin

First Known Use of homocercal

1838, in the meaning defined at sense 1

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The first known use of homocercal was in 1838

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