Uredo
Uredo , noun
[Latin, a blast, blight, a burning itch, from urere to burn, to scorch.]
1.
(Botany) 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.
2.
(Medicine) Nettle rash. See Urticaria.