|jefə(ˌ)rō|sərkəl adjective
Etymology: Greek gephyro- (from gephyra ) + English -cercal
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
• geph·y·ro·cer·cy ˈ ̷ ̷ ̷ ̷ ̷ ̷ˌsərsē noun -es