Webster's English Dictionary

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herpes

her.pes \'h*r-(.)pe-z\ \(.)h*r-'pet-ik\ n [L, fr. Gk herpe-s, fr. herpein 
   to creep - more at SERPENT)M : any of several virus diseases characterized 
   by the formation of blisters  on the skin or mucous membranes - her.pet.ic 
   aj