- pygopagus
[pygopagus 词源字典]
- "A pair of conjoined twins united in the region of the buttocks (usually at the sacrum and coccyx); either of a pair of such twins", Mid 19th cent. From pygo- + -pagus, after French pygopage; compare earlier pygopage.[pygopagus etymology, pygopagus origin, 英语词源]