— heterocercality /het'euhr oh seuhr kal"i tee/ , n.
/het'euhr euh serr"keuhl/ , adj. Ichthyol.
having an unequally divided tail, characteristic of sharks, rays, and skates. Cf. diphycercal, homocercal .
[ 1830-40; HETERO- + Gk kérk ( os ) a tail + -AL 1 ]