heterocercal
Pronunciation: /ˌhɛtərəʊˈsəːkəl/
Definition of heterocercal
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.
Origin:
mid 19th century: from hetero- 'other' + Greek kerkos 'tail'
