Wordnet 3.0
NOUN (1)
1. 
 a skin disease characterized by large thin-walled blisters (bullae) arising from normal skin or mucous membrane; 
The Collaborative International Dictionary of English v.0.48:
Pemphigus \Pem*phi"gus\, n. [Nl., fr. Gr. ?, ?, a bubble.]
   (Med.)
   A somewhat rare skin disease, characterized by the
   development of blebs upon different parts of the body.
   --Quain.
   [1913 Webster]
WordNet (r) 3.0 (2006):
pemphigus
    n 1: a skin disease characterized by large thin-walled blisters
         (bullae) arising from normal skin or mucous membrane