Protocercal

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Protocercal \Pro`to*cer"cal\, a. [Proto- + Gr. ? the tail.]
     (Zool.)
     Having a caudal fin extending around the end of the vertebral
     column, like that which is first formed in the embryo of
     fishes; diphycercal.
     [1913 Webster]