Webster's English Dictionary

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ulcer

1. ul.cer \'*l-s*r\ n [ME, fr. L ulcer-, ulcus; akin to Gk helkos wound] 1: 
   a break in skin or mucous membrane with loses of surface tissue, disinte 
   gration and necrosis of epithelial tissue, and often pus 2: something that 
   festers and corrupts like an open sore 
2. ulcer \'*ls-(*-)rin\ vb or ul.cer.ing : ULCERATE