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Definition of: heterocercy
(het′ər·ə·sûr′sē) noun Zool.
Inequality of the caudal fin of a fish produced by the extension of the vertebral column upward and consequent enlargement of one of the lobes, as in sharks, sturgeons, etc. [<HETERO- + Gk. kerkos tail]
—het′er·o·cer′cal (-sûr′kəl) adjective
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