(botany) The reddish pustule that occurs on the leaves of a plant infected with rust fungus.

plural of urediospore

urediniospore

plural of uredinium

plural of urediniospore

plural of urease

plural of urea

plural of ureaplasma

Any member of the genus Ureaplasma of urease-positive bacteria

(botany, countable) A summer stage in the life history of certain rusts (Uredinales), regarded at one time as a distinct genus, and preceding the teleutospore, or winter stage.