noun
1. : any of several rusts that attack roses: as
a. : a rust of the genus Phragmidium
b. : a rust of the genus Earlea
2. : disease caused by a rose rust
noun
1. : any of several rusts that attack roses: as
a. : a rust of the genus Phragmidium
b. : a rust of the genus Earlea
2. : disease caused by a rose rust
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012