Uredo \U*re"do\, n. [L., a blast, blight, a burning itch, fr.
   urere to burn, to scorch.]
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   1. (Bot.) One of the stages in the life history of certain
      rusts (order 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.
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   2. (Med.) Nettle rash. See Urticaria.
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