\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}.