| pygopagus | Conjoined twins in which the two individuals are joined at the buttocks, most often back to back. See: conjoined twins. Origin: pygo-+ G. Pagos, something fixed (05 Mar 2000) |
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| parabiotic | Relating to, or characterised by, parabiosis. (05 Mar 2000) |
| parabiotic flap | A skin flap bridging from one animal to another. (05 Mar 2000) |