Medical Dictionary

rust

noun \ˈrəst\

Medical Definition of RUST

1
:  the reddish brittle coating formed on iron especially when chemically attacked by moist air and composed essentially of hydrated ferric oxide
2
:  any of numerous destructive diseases of plants produced by fungi (order Uredinales) and characterized by reddish brown pustular lesions; also :  a fungus causing this

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