A conjoined twin or double-bodied person sharing abdominal organs, from Greek roots meaning 'belly brother'.
From Greek 'koilia' (belly) + 'adelphos' (brother). This medical term emerged in 19th-century anatomical texts to describe rare congenital conditions where twins remain connected at the abdomen.
This word represents how doctors created precise Greek-derived terminology to describe unusual births before modern imaging—it's like medical detectives naming something they'd only glimpsed once or twice in their entire careers.
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