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

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