1. 
   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) ...
   Found op http://www.mondofacto.com/facts/dictionary?pygopagus
   
   
2. 
   pygopagus
   (pi-gop´ә-gәs) conjoined twins fused in the sacral region.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   pygopagus
   pygopagous, pygopagus Twins united in the region of the buttocks so that the two are back to back.
   Found op http://www.wordinfo.info/words/index/info/view_unit/1807/2
   
   
4. 
   pygopagus
   Type: Term Pronunciation: pī-gop′ă-gŭs Definitions: 1. Conjoined twins in which the two individuals are joined at the buttocks, most often back to back. See: conjoined twins, under twin
   Found op http://www.medilexicon.com/medicaldictionary.php?t=74319
   
   

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