n, pl  pan*ni   1  :  a vascular tissue causing a superficial opacity of the cornea and occurring esp. in trachoma  2  :  a sheet of inflammatory granulation tissue that spreads from the synovial membrane and invades the joint in rheumatoid arthritis ultimately leading to fibrous ankylosis .
 
 
 
Similar sounding terms:  pan·a·cea  penes  pe·nis  Pi·nus 
 
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