Wordnet 3.0
ADJECTIVE (1)
1.
possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes);
The Collaborative International Dictionary of English v.0.48:
Homocercal \Ho`mo*cer"cal\, a. [Homo- + Gr. ? tail.] (Zool.)
Having the tail nearly or quite symmetrical, the vertebral
column terminating near its base; -- opposed to heterocercal.
[1913 Webster]
WordNet (r) 3.0 (2006):
homocercal
adj 1: possessing a symmetrical tail that extends beyond the end
of the vertebral column (as in most bony fishes) [ant:
heterocercal]