diph·y·cer·cal (d f -sûr k l)adj. Having or designating a tail fin in which the vertebral column extends to the tip, with symmetrical upper and lower parts. [Greek diphu  s, double; see diphyodont + kerkos, tail + -al.]diph·y·cer cy (-sûrs) n. |
diphycercal [ˌdɪfɪˈsɜːkəl]
adj
(Life Sciences & Allied Applications / Zoology) Ichthyol of or possessing a symmetrical or pointed tail with the vertebral column extending to the tip, as in primitive fishes
[from Greek diphuēs twofold (from di1 + phuē growth) + kerkos tail]
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