A conjoined twin fetus with duplication of parts along the body axis.
From Greek 'ana-' (up, back) + 'kata-' (down) + 'didymos' (twin). The prefix combination describes symmetrical duplication in opposite directions.
Medical terminology for birth anomalies comes from Greek—anacatadidymus and its cousins (like xiphopagus and craniopagus) create a kind of morbid poetry while conveying precise anatomical information.
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