Source : Webster's Revised Unabridged Dictionary (1913)

Pemphigus \Pem*phi"gus\, n. [Nl., fr. Gr. ?, ?, a bubble.]
   (Med.)
   A somewhat rare skin disease, characterized by the
   development of blebs upon different part of the body.
   --Quain.

Source : WordNet®

pemphigus
     n : a skin disease characterized by large thin-walled blisters
         (bullae) arising from normal skin or mucous membrane