Hypertext Webster Gateway: "heterocercal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Heterocercal \Het`er*o*cer"cal\, a. [Hetero- + Gr. ? tail.]
(Anat.)
Having the vertebral column evidently continued into the
upper lobe of the tail, which is usually longer than the
lower one, as in sharks.
From WordNet (r) 1.7 (wn)
heterocercal
adj : (ichthyology) possessing a tail with the upper lobe larger
than the lower and with the vertebral column prolonged
into the upper lobe [ant: {homocercal}]
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