A conjoined twin or fetus with two bodies joined at the stomach region.
From Greek 'gastro-' meaning stomach and 'didymus' meaning twin. The term combines medical Greek terminology to describe a specific type of congenital anomaly where twins fail to separate completely.
This rare medical condition reveals how embryologists can predict developmental stages by understanding where body fusion occurs—the stomach region connection suggests the separation happened at a very specific point during fetal development.
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