Source : Webster's Revised Unabridged Dictionary (1913)

Uredo \U*re"do\, n. [L., a blast, blight, a burning itch, fr.
   urere to burn, to scorch.]
   1. (Bot.) One of the stages in the life history of certain
      rusts ({Uredinales}), regarded at one time as a distinct
      genus. It is a summer stage preceding the teleutospore, or
      winter stage. See {Uredinales}, in the Supplement.

   2. (Med.) Nettle rash. See {Urticaria}.