pygodidymus

Conjoined twins with a single cephalothoracic region but with the buttocks and parts below doubled. See conjoined twins, under twin. SEE ALSO: duplicitas posterior. [pygo- + G. didymos, twin]

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py·go·did·y·mus (pi″go-didґĭ-məs) [pygo- + -didymus] a fetus with double hips and pelvis.