Search Result for "homocercal fin":
Wordnet 3.0

NOUN (1)

1. symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes; 



WordNet (r) 3.0 (2006):

homocercal fin
    n 1: symmetrical tail fin extending beyond the end of the
         vertebral column as in most bony fishes [ant: heterocercal
         fin]