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por·phy·rin

n :  any of various compounds with a structure that consists essentially of four pyrrole rings joined by four =CH- groups : esp  :  one (as chlorophyll or hemoglobin) containing a central metal atom and usu. having biological activity .
 
 
 
Similar sounding terms:  para·phre·nia  par·ooph·o·ron  peri·ovar·i·an 

 
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