Heterocercal meaning

hĕtə-rō-sûrkəl
Relating to, having, or being a tail fin in which the upper lobe is larger than the lower and the vertebral column extends into the upper lobe, as in sharks.
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Designating, of, or having a tail fin in which the upper lobe is larger than the lower and contains the upturned end of the spinal column, as in certain fishes, esp. sharks.
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(ichthyology) Of a fish's tail, such that the vertebral column bends and extends upwards into the upper lobe of the tail, making it larger than the lower lobe; as in sharks, rays, and skates.
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Origin of heterocercal

  • hetero– Greek kerkos tail –al

    From American Heritage Dictionary of the English Language, 5th Edition