geph·y·ro·cer·cal
| \ ¦jefə(ˌ)rō¦sərkəl \
Definition of gephyrocercal
1
: having the dorsal and anal fins confluent at the aborted end of the vertebral column of a fish's tail
2
: having or relating to a gephyrocercal tail
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Merriam-Webster unabridged
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