Definition of heterocercal in English:

heterocercal

Syllabification: het·er·o·cer·cal
Pronunciation: /ˌhetərōˈsərkəl
 
/

adjective

Zoology
  • (Of a fish’s tail) having unequal upper and lower lobes, usually with the vertebral column passing into the upper. Contrasted with diphycercal, homocercal.
    More example sentences
    • The tail is heterocercal, with the upper lobe containing long, thread-like filaments.
    • The body shows well-developed paired lateral fins (presumably true pectoral fins), indicating good stability, dorsal and anal fins, and a heterocercal tail (the lower lobe of the tail is elongated).
    • The sturgeon heterocercal tail is extremely flexible and the upper tail lobe trails the lower during the fin beat cycle.

Origin

mid 19th century: from hetero- 'other' + Greek kerkos 'tail'.

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Pronunciation: kərf
noun
a slit made by cutting with a saw